Update Git logic to account for CP to prod

[roryabraham]

Problem

All of our git logic (most significantly, GitUtils.getPullRequestsMergedBetween) is designed and tested to work for both normal releases and for PRs CP'd to staging. It does not currently account for PRs CP'd to prod.

Solution

Unfortunately this section of the design doc was a bit hand-wavy, but the order of operations here will be:

1. Update CIGitLogicTests to include scenarios for CP to Prod.
2. If it works with no further changes - great! If not, figure out what we need to do to correctly list PRs deployed between two versions. This is used for:
   • creating checklists
   • leaving deploy comments
   • generating GitHub Releases

[melvin-bot]

Triggered auto assignment to @VictoriaExpensify (NewFeature), see https://stackoverflowteams.com/c/expensify/questions/14418#:~:text=BugZero%20process%20steps%20for%20feature%20requests for more details. Please add this Feature request to a GH project, as outlined in the SO.

[melvin-bot]

⚠️ It looks like this issue is labelled as a New Feature but not tied to any GitHub Project. Keep in mind that all new features should be tied to GitHub Projects in order to properly track external CAP software time ⚠️

[melvin-bot]

Triggered auto assignment to Design team member for new feature review - @dubielzyk-expensify (NewFeature)

[roryabraham]

There's nothing blocking me here, but I'm planning to prioritize #58775 and #58777 first