If a subscription has an already open PR and a subscription is triggered, but no changes to flow are detected, we still proceed to update the in progress pull request, even tho we didn't update the PR.
When we do this we update the ContainedSubscriptions property, and set the build id of the build we tried flowing, but determined we shouldn't.

The codeflow check reads this property later, and compares it with the build in the repo, and turns red when they don't align