Update darc BAR tokens authentication method

[martinrrm]

Bug

Fixes: NuGet/Home#13656

Description

We were asked to change how we get the BAR id, the linked issue suggested these code changes.

PR Checklist

• Meaningful title, helpful description and a linked NuGet/Home issue
• [] Added tests
• Link to an issue or pull request to update docs if this PR changes settings, environment variables, new feature, etc.

[premun]

Looks good!

Please note that you will need your internal pipeline approved for use of the service connection. Once the internal build runs, it will block on the approval until an admin from your AzDO (devdiv or dnceng?) org approves.

[premun]

FYI you can do this in YAML:

Suggested change

	inlineScript: |
	dotnet msbuild $(Build.Repository.LocalPath)\build\publish.proj /t:PublishToBuildAssetRegistry /property:NuGetClientNupkgsDirectoryPath=$(Build.Repository.LocalPath)\artifacts\$(NupkgOutputDir) /property:BUILD_BUILDNUMBER=$(Build.BuildNumber) /property:BUILD_SOURCEBRANCH=$(Build.SourceBranchName) /property:BUILD_SOURCEVERSION=$(Build.SourceVersion) /property:BUILD_REPOSITORY_URI=$(Build.Repository.Uri) /property:BUILD_REPOSITORY_NAME=$(Build.Repository.Name) /property:ArtifactsLogDir=$(Build.Repository.LocalPath)\artifacts\manifests\ /binarylogger:$(Build.StagingDirectory)\binlog\21.PublishToBuildAssetRegistry.binlog
	inlineScript: >
	dotnet msbuild $(Build.Repository.LocalPath)\build\publish.proj /t:PublishToBuildAssetRegistry
	/property:NuGetClientNupkgsDirectoryPath=$(Build.Repository.LocalPath)\artifacts\$(NupkgOutputDir)
	/property:BUILD_BUILDNUMBER=$(Build.BuildNumber)
	/property:BUILD_SOURCEBRANCH=$(Build.SourceBranchName)
	/property:BUILD_SOURCEVERSION=$(Build.SourceVersion)
	/property:BUILD_REPOSITORY_URI=$(Build.Repository.Uri)
	/property:BUILD_REPOSITORY_NAME=$(Build.Repository.Name)
	/property:ArtifactsLogDir=$(Build.Repository.LocalPath)\artifacts\manifests\
	/binarylogger:$(Build.StagingDirectory)\binlog\21.PublishToBuildAssetRegistry.binlog

[dotnet-policy-service]

This PR has been automatically marked as stale because it has no activity for 7 days. It will be closed if no further activity occurs within another 7 days of this comment. If it is closed, you may reopen it anytime when you're ready again, as long as you don't delete the branch.