Bug

Fixes: https://github.com/NuGet/Client.Engineering/issues/3647

Description

A recent change made to our loc process was to only run for dev and a release branch designated in the OneLocReleaseBranch pipeline variable.

However, the YAML condition was written as a template expression, meaning runtime variables are not yet loaded by the ADO job. Therefore, the condition evaluated to false and did not pass RunOneLocBuild.

I've moved the check to the pipeline.yml with a runtime condition.

• The official.yml will pass TryRunOneLocBuild: true to inject the stage at compile-time, and then the stage itself will condition on the branches at runtime.
  This way, PR builds don't see the stage at all (just to waste time evaluating the branch name and ultimately skipping running OneLoc on PR builds).
• Compares directly against Build.SourceBranch to the OneLocReleaseBranch and tries trimming refs/heads/ in case someone puts that in the build variable at some point which would result in a localization issue otherwise.

Tested by switching the variable to one of my branches and running to ensure it can read the ADO variable: https://dev.azure.com/devdiv/DevDiv/_build/results?buildId=13359377&view=results

Will need cherry-pick to release-7.3.x.

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.