Fix _AssemblyInTargetingPack value during servicing (#95278)

* Fix _AssemblyInTargetingPack value during servicing

The _AssemblyInTargetingPack property in packaging.targets depends on
`IsNETCoreAppSrc` or `IsNetCoreAppRef` which aren't defined until
src/libraries/Directory.Build.targets is imported.

As packaging.targets is imported first, there's a property sequencing
issue.

The fix is to move the ´_AssemblyInTargetingPack` logic out of
packaging.targets as that's code that is specific to targeting pack
libraries which reside under src/libraries.

This fixes the issue that appeared in the release/8.0 branch for main.

* Update Directory.Build.targets

* Update Directory.Build.targets

eng/packaging.targets

@@ -62,11 +62,6 @@
     <!-- Always update the package version in servicing. -->
     <Version>$(MajorVersion).$(MinorVersion).$(ServicingVersion)</Version>
     <Version Condition="'$(VersionSuffix)' != ''">$(Version)-$(VersionSuffix)</Version>
-    <_IsWindowsDesktopApp Condition="$(WindowsDesktopCoreAppLibrary.Contains('$(AssemblyName);'))">true</_IsWindowsDesktopApp>
-    <_IsAspNetCoreApp Condition="$(AspNetCoreAppLibrary.Contains('$(AssemblyName);'))">true</_IsAspNetCoreApp>
-    <_AssemblyInTargetingPack Condition="('$(IsNETCoreAppSrc)' == 'true' or '$(IsNetCoreAppRef)' == 'true' or '$(_IsAspNetCoreApp)' == 'true' or '$(_IsWindowsDesktopApp)' == 'true') and '$(TargetFrameworkIdentifier)' != '.NETFramework'">true</_AssemblyInTargetingPack>
-    <!-- The assembly version gets updated when the assembly isn't part of a targeting pack. -->
-    <AssemblyVersion Condition="'$(_AssemblyInTargetingPack)' != 'true'">$(MajorVersion).$(MinorVersion).0.$(ServicingVersion)</AssemblyVersion>
   </PropertyGroup>
 
   <ItemGroup>

src/libraries/Directory.Build.targets

@@ -70,6 +70,16 @@
                                    '$(GeneratePlatformNotSupportedAssemblyMessage)' == ''">true</ILLinkTrimAssembly>
   </PropertyGroup>
 
+  <!-- The assembly version gets updated during servicing when the assembly isn't part of a targeting pack. -->
+  <PropertyGroup Condition="'$(PreReleaseVersionLabel)' == 'servicing' and
+                            '$(IsPackable)' == 'true' and
+                            '$(PackageUseIncrementalServicingVersion)' == 'true'">
+    <_IsWindowsDesktopApp Condition="$(WindowsDesktopCoreAppLibrary.Contains('$(AssemblyName);'))">true</_IsWindowsDesktopApp>
+    <_IsAspNetCoreApp Condition="$(AspNetCoreAppLibrary.Contains('$(AssemblyName);'))">true</_IsAspNetCoreApp>
+    <_AssemblyInTargetingPack Condition="('$(IsNETCoreAppSrc)' == 'true' or '$(IsNetCoreAppRef)' == 'true' or '$(_IsAspNetCoreApp)' == 'true' or '$(_IsWindowsDesktopApp)' == 'true') and '$(TargetFrameworkIdentifier)' != '.NETFramework'">true</_AssemblyInTargetingPack>
+    <AssemblyVersion Condition="'$(_AssemblyInTargetingPack)' != 'true'">$(MajorVersion).$(MinorVersion).0.$(ServicingVersion)</AssemblyVersion>
+  </PropertyGroup>
+
   <Import Project="$(RepositoryEngineeringDir)versioning.targets" />
   <Import Project="$(RepositoryEngineeringDir)intellisense.targets" Condition="'$(IsSourceProject)' == 'true'" />