feat: [FC-0074] use linter for event code-annotations

[mariajgrimaldi]

Description

This PR adds a linter for event code-annotations to raise quality errors when one required field is missing. This PR depends on:
openedx/edx-lint#478

Testing instructions

You can see it working here: https://github.com/openedx/openedx-events/actions/runs/12712053147/job/35436767992?pr=448#step:6:26

1. Move to this branch
2. Create a new event (a dummy one) following the proposed format for the classes' docstring, then run pylint openedx_events/learning/events.py.

# Location: openedx_events/learning/data.py
class MyData:
    """MyData class"""
    my_field = attr.ib(type=str)

# Location: openedx_events/learning/signals.py
# .. event_type: org.openedx.learning.my_event.v1
# .. event_name: MY_EVENT
# .. event_description: My event description
# .. event_data: MyData
# .. event_trigger_repository: openedx/edx-platform
MY_EVENT = OpenEdxPublicSignal(
    event_type="org.openedx.learning.my_event.v1",
    data={
        "my_data": MyData,
    }
)

3. Remove an annotation and review the output of pylint openedx_events/learning/events.py once again.

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)

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[sarina]

This looks good to me, but I don't know this repo well (and am not a CC on it) so I can't provide an approving review.

[mariajgrimaldi]

I'll update this PR once #448 is merged!

[mariajgrimaldi]

Hey, @bmtcril: could you help me with a review here? :) Thank you!

[bmtcril]

LGTM!