Add reopenIssueWithComment GitHub Action

[deetergp]

PullerBear chooses: @Jag96

cc @roryabraham @AndrewGable

Details

This PR adds two GitHub Actions: checkDeployBlockers and reopenWithComment. The former evaluates recently closed issues, checking whether they have the StagingDeployCash label, and if they do, checks the issue description for open markdown checkboxes (- [ ]) and whether the last comment is missing the :shipit: string. If either is true, the latter action is run which reopens the issue and leaves a comment.

Fixed Issues

Fixes https://github.com/Expensify/Expensify/issues/155248

Tests

I mirrored all this logic in a personal test repo and verified that it worked. I did the following:

1. Created an issue with three checklist items and left one unchecked.
2. Closed the issue & verified that it was reopened with the expected comment.
3. Checked the last box, close the issue, and verified that it reopened with the correct comment.
4. Commented with the string :shipit: and close the issue gain
5. Verified that the issue stayed closed.

Unit Tests

tests/unit/checkDeployBlockersTest.js

[deetergp]

Updated to address @roryabraham's comments.

[roryabraham]

Cool, I had a few organizational suggestions but all were pretty subjective so no blockers from me!

[Jag96]

Looking good, just a few nabs/questions

[deetergp]

I had to make a compromise in order to not kill all the tests with process.exit(0) nor get errors by return; -ing without a check.

[deetergp]

Updated to address new comments.

[roryabraham]

Looking good!

[deetergp]

Updated to address Joe's comment; added new test case for when there are no comments on an issue.

[Jag96]

LGTM!

[roryabraham]

Going to hold off on merging this today, because I want to run a production deploy and I don't want to introduce any new variables that might make it not work. This PR looks good, but I am 🐔 and don't want to test my luck until after we get all these PRs deployed.