[Build]: Use one debian mirror config (#10274)

Why I did it
Use one debian mirror config.
The empty config in https://github.com/Azure/sonic-buildimage/blob/master/files/image_config/apt/sources.list overrides the file https://github.com/Azure/sonic-buildimage/blob/master/files/apt/sources.list.amd64 (armhf/arm64), it does not make sense.
All the content in files/image_config/apt is no use, any one wants to add mirror config, please add in files/apt.

How I did it
Remove files/image_config/apt and the reference.

files/apt/sources.list.amd64

@@ -1,15 +1,13 @@
 ## Debian mirror on Microsoft Azure
 ## Ref: http://debian-archive.trafficmanager.net/
 
-deb [arch=amd64] http://deb.debian.org/debian/ bullseye main contrib non-free
-deb-src [arch=amd64] http://deb.debian.org/debian/ bullseye main contrib non-free
-#deb [arch=amd64] http://debian-archive.trafficmanager.net/debian/ bullseye main contrib non-free
-#deb-src [arch=amd64] http://debian-archive.trafficmanager.net/debian/ bullseye main contrib non-free
-#deb [arch=amd64] http://debian-archive.trafficmanager.net/debian-security/ bullseye/updates main contrib non-free
-#deb-src [arch=amd64] http://debian-archive.trafficmanager.net/debian-security/ bullseye/updates main contrib non-free
-#deb [arch=amd64] http://debian-archive.trafficmanager.net/debian/ bullseye-backports main contrib non-free
-#deb [arch=amd64] http://packages.trafficmanager.net/debian/debian bullseye main contrib non-free
-#deb-src [arch=amd64] http://packages.trafficmanager.net/debian/debian bullseye main contrib non-free
-#deb [arch=amd64] http://packages.trafficmanager.net/debian/debian-security/ bullseye_updates main contrib non-free
-#deb-src [arch=amd64] http://packages.trafficmanager.net/debian/debian-security/ bullseye_updates main contrib non-free
-#deb [arch=amd64] http://packages.trafficmanager.net/debian/debian bullseye-backports main contrib non-free
+deb [arch=amd64] http://debian-archive.trafficmanager.net/debian/ bullseye main contrib non-free
+deb-src [arch=amd64] http://debian-archive.trafficmanager.net/debian/ bullseye main contrib non-free
+deb [arch=amd64] http://debian-archive.trafficmanager.net/debian-security/ bullseye-security main contrib non-free
+deb-src [arch=amd64] http://debian-archive.trafficmanager.net/debian-security/ bullseye-security main contrib non-free
+deb [arch=amd64] http://debian-archive.trafficmanager.net/debian/ bullseye-backports main contrib non-free
+deb [arch=amd64] http://packages.trafficmanager.net/debian/debian bullseye main contrib non-free
+deb-src [arch=amd64] http://packages.trafficmanager.net/debian/debian bullseye main contrib non-free
+deb [arch=amd64] http://packages.trafficmanager.net/debian/debian-security/ bullseye-security main contrib non-free
+deb-src [arch=amd64] http://packages.trafficmanager.net/debian/debian-security/ bullseye-security main contrib non-free
+deb [arch=amd64] http://packages.trafficmanager.net/debian/debian bullseye-backports main contrib non-free

files/apt/sources.list.arm64

@@ -1,13 +1,13 @@
 ## Debian mirror for ARM
 ## Not the repo mirror site can change in future, and needs to be updated to be in sync
 
-deb [arch=arm64] http://deb.debian.org/debian bullseye main contrib non-free
-deb-src [arch=arm64] http://deb.debian.org/debian bullseye main contrib non-free
-deb [arch=arm64] http://deb.debian.org/debian bullseye-updates main contrib non-free
-deb-src [arch=arm64] http://deb.debian.org/debian bullseye-updates main contrib non-free
-deb [arch=arm64] http://ftp.debian.org/debian bullseye-backports main
-# deb [arch=arm64] http://packages.trafficmanager.net/debian/debian bullseye main contrib non-free
-# deb-src [arch=arm64] http://packages.trafficmanager.net/debian/debian bullseye main contrib non-free
-# deb [arch=arm64] http://packages.trafficmanager.net/debian/debian bullseye-updates main contrib non-free
-# deb-src [arch=arm64] http://packages.trafficmanager.net/debian/debian bullseye-updates main contrib non-free
-# deb [arch=arm64] http://packages.trafficmanager.net/debian/debian bullseye-backports main
+deb [arch=arm64] http://debian-archive.trafficmanager.net/debian/ bullseye main contrib non-free
+deb-src [arch=arm64] http://debian-archive.trafficmanager.net/debian/ bullseye main contrib non-free
+deb [arch=arm64] http://debian-archive.trafficmanager.net/debian-security/ bullseye-security main contrib non-free
+deb-src [arch=arm64] http://debian-archive.trafficmanager.net/debian-security/ bullseye-security main contrib non-free
+deb [arch=arm64] http://debian-archive.trafficmanager.net/debian/ bullseye-backports main contrib non-free
+deb [arch=arm64] http://packages.trafficmanager.net/debian/debian bullseye main contrib non-free
+deb-src [arch=arm64] http://packages.trafficmanager.net/debian/debian bullseye main contrib non-free
+deb [arch=arm64] http://packages.trafficmanager.net/debian/debian-security/ bullseye-security main contrib non-free
+deb-src [arch=arm64] http://packages.trafficmanager.net/debian/debian-security/ bullseye-security main contrib non-free
+deb [arch=arm64] http://packages.trafficmanager.net/debian/debian bullseye-backports main contrib non-free

files/apt/sources.list.armhf

@@ -1,13 +1,13 @@
 ## Debian mirror for ARM
 ## Not the repo mirror site can change in future, and needs to be updated to be in sync
 
-deb [arch=armhf] http://deb.debian.org/debian bullseye main contrib non-free
-deb-src [arch=armhf] http://deb.debian.org/debian bullseye main contrib non-free
-deb [arch=armhf] http://deb.debian.org/debian bullseye-updates main contrib non-free
-deb-src [arch=armhf] http://deb.debian.org/debian bullseye-updates main contrib non-free
-deb [arch=armhf] http://ftp.debian.org/debian bullseye-backports main
-# deb [arch=armhf] http://packages.trafficmanager.net/debian/debian bullseye main contrib non-free
-# deb-src [arch=armhf] http://packages.trafficmanager.net/debian/debian bullseye main contrib non-free
-# deb [arch=armhf] http://packages.trafficmanager.net/debian/debian bullseye-updates main contrib non-free
-# deb-src [arch=armhf] http://packages.trafficmanager.net/debian/debian bullseye-updates main contrib non-free
-# deb [arch=armhf] http://packages.trafficmanager.net/debian/debian bullseye-backports main
+deb [arch=armhf] http://debian-archive.trafficmanager.net/debian/ bullseye main contrib non-free
+deb-src [arch=armhf] http://debian-archive.trafficmanager.net/debian/ bullseye main contrib non-free
+deb [arch=armhf] http://debian-archive.trafficmanager.net/debian-security/ bullseye-security main contrib non-free
+deb-src [arch=armhf] http://debian-archive.trafficmanager.net/debian-security/ bullseye-security main contrib non-free
+deb [arch=armhf] http://debian-archive.trafficmanager.net/debian/ bullseye-backports main contrib non-free
+deb [arch=armhf] http://packages.trafficmanager.net/debian/debian bullseye main contrib non-free
+deb-src [arch=armhf] http://packages.trafficmanager.net/debian/debian bullseye main contrib non-free
+deb [arch=armhf] http://packages.trafficmanager.net/debian/debian-security/ bullseye-security main contrib non-free
+deb-src [arch=armhf] http://packages.trafficmanager.net/debian/debian-security/ bullseye-security main contrib non-free
+deb [arch=armhf] http://packages.trafficmanager.net/debian/debian bullseye-backports main contrib non-free

files/build_templates/sonic_debian_extension.j2

@@ -75,12 +75,6 @@ else
     sudo chroot $FILESYSTEM_ROOT $DOCKER_CTL_SCRIPT start
 fi
 
-# Apply apt configuration files
-sudo cp $IMAGE_CONFIGS/apt/sources.list $FILESYSTEM_ROOT/etc/apt/
-sudo mkdir -p $FILESYSTEM_ROOT/etc/apt/sources.list.d/
-sudo cp -R $IMAGE_CONFIGS/apt/sources.list.d/${CONFIGURED_ARCH}/* $FILESYSTEM_ROOT/etc/apt/sources.list.d/
-cat $IMAGE_CONFIGS/apt/sonic-dev.gpg.key | sudo LANG=C chroot $FILESYSTEM_ROOT apt-key add -
-
 # Update apt's snapshot of its repos
 sudo LANG=C DEBIAN_FRONTEND=noninteractive chroot $FILESYSTEM_ROOT apt-get update