feat: [FC-0074] add event trigger information in code annotations

[mariajgrimaldi]

Description

This PR adds a new code annotation for events indicating where they are being triggered from, including the repository and source file. When rendered in the docs, a link redirects to a GH search with the source file and the event name.

Events without a triggering field are not being used in any service or are candidates for deprecation: #445

Supporting information

This PR addresses a concern raised by this PR removing hooks docs from edx-platform: openedx/edx-platform#35921 (comment), where the table referencing where each event was triggered from was dropped.

This PR depends on: openedx/code-annotations#143

Testing instructions

You can review the changes here: https://docsopenedxorg--443.org.readthedocs.build/projects/openedx-events/en/443/reference/events.html

Deadline

None

Checklists

Check off if complete or not applicable:

Merge Checklist:

• All reviewers approved
• Reviewer tested the code following the testing instructions
• CI build is green
• Version bumped
• Changelog record added with short description of the change and current date
• Documentation updated (not only docstrings)
• Code dependencies reviewed
• Fixup commits are squashed away
• Unit tests added/updated
• Noted any: Concerns, dependencies, migration issues, deadlines, tickets

Post Merge:

• Create a tag
• Create a release on GitHub
• Check new version is pushed to PyPI after tag-triggered build is
  finished.
• Delete working branch (if not needed anymore)
• Upgrade the package in the Open edX platform requirements (if applicable)

[openedx-webhooks]

Thanks for the pull request, @mariajgrimaldi!

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[sarina]

I'm going to defer my review to @bmtcril since he knows a lot more about this than I do.