allow first party subdomains when blocking 3rd-party cookies to match… (uplift to 1.7.x)

[bsclifton]

Uplift of #5318
Fixes brave/brave-browser#9337

Approved, please ensure that before merging:

• You have checked CI and the builds, lint, and tests all pass or are not related to your PR.
• You have tested your change on Nightly.
• The PR milestones match the branch they are landing to.

After you merge:

• The associated issue milestone is set to the smallest version that the changes is landed on.

[kjozwiak]

Going to restart macOS as test-install failed as per https://ci.brave.com/job/brave-browser-build-pr/job/issue-9337-1.7.x/1/execution/node/635/log/.

06:43:38  + BROWSER='Brave Browser Nightly'
06:43:38  + BUILD_TYPE=Release
06:43:38  + SKIP_SIGNING=true
06:43:38  + OUT_DIR=/Users/jenkins/jenkins/workspace/rowser-build-pr_issue-9337-1.7.x/src/out/Release
06:43:38  + '[' true = true ']'
06:43:38  + hdiutil attach -nobrowse '/Users/jenkins/jenkins/workspace/rowser-build-pr_issue-9337-1.7.x/src/out/Release/unsigned_dmg/Brave Browser Nightly.dmg'
06:43:38  Checksumming Driver Descriptor Map (DDM : 0)…
06:43:38       Driver Descriptor Map (DDM : 0): verified   CRC32 $FFC85CD3
06:43:38  Checksumming Apple (Apple_partition_map : 1)…
06:43:38       Apple (Apple_partition_map : 1): verified   CRC32 $61CB2ECA
06:43:38  Checksumming DiscRecording 9.0.3d5 (Apple_HFS : 2)…
06:43:48  DiscRecording 9.0.3d5 (Apple_HFS : 2: verified   CRC32 $25D0EB10
06:43:48  verified   CRC32 $2E04CE12
06:43:48  /dev/disk2          	Apple_partition_scheme         	
06:43:48  /dev/disk2s1        	Apple_partition_map            	
06:43:48  /dev/disk2s2        	Apple_HFS                      	/Volumes/Brave Browser Nightly
06:43:48  + sleep 10
06:43:59  + open '/Volumes/Brave Browser Nightly/Brave Browser Nightly.app'
06:43:59  LSOpenURLsWithRole() failed with error -600 for the file /Volumes/Brave Browser Nightly/Brave Browser Nightly.app.

Even though this is an intermittent issue, looks like test-install never ran so going to restart as per the above.

[kjozwiak]

QA verified #5318 on Nightly via desktop as per #5318 (comment).

However, it doesn't appear to be fixed on Android as per #5318 (comment), #5318 (comment) and #5318 (comment). The Android issue will be addressed in another issue once @jumde takes a look and creates the issue.

[kjozwiak]

Uplift into 1.7.x approved after deliberating with @brave/uplift-approvers. Please make sure that all the correct labels are used and the associated issue is moved into the correct milestone.