When multiple target labels are applied to a PR, it should be considered invalid as our tooling does not support a single PR targetting multiple trains/versions. PR Close #40156
Separate retrieving targeted branches from printing the branches to allow for other tools to better integrate with the results. PR Close #39897
Create a command in the `ng-dev` toolset that allows user's to check what branches a PR will merge into based on its targeting. PR Close #39504