Added yml file for automatic comments on ingestion completion

[Azax4]

Created a workflow for when PRs related to ingestions are closed. The workflow first tries to determine if it is indeed an ingestion related workflow. If not, it stops.

Forced to use GraphQL because I won't have access to the linked development issue numbers by default. (ChatGPT confirms this, but happy to change if someone else has a way to get that information). Doesn't need any additional dependencies other than actions/github-script@v7, so it should be fairly simple to set up.

• Still need to test it out fully. Make sure to use the following to avoid interrupting production

on:
push:
branches:
- automation-for-closed-ingestion-requests
pull_request:
branches:
- automation-for-closed-ingestion-requests

• Used https://github.com/acl-org/acl-anthology/blob/master/.github/workflows/preview.yml as a reference point for generating volumes of potential interest. Check if this makes sense or need to filter it out further
• Cleanup code and comments
• Remove unnecessary dependencies
• Figure out how to set up correct credentials for GraphQuery