[BD-32] feat: add 2nd batch of Open edX Events

[mariajgrimaldi]

Description

Second batch of Open edX Events, a continuation of #28266. This time around we add the following events:

• Add COURSE_ENROLLMENT_CHANGED: sent after the enrollment update
• Add COURSE_UNENROLLMENT_COMPLETED: sent after the user's unenrollment
• Add CERTIFICATE_CREATED after the user's certificate generation has
  been completed
• Add CERTIFICATE_CHANGED: after the certification update has been
  completed
• Add CERTIFICATE_REVOKED: after the certificate revocation has been completed.
• Add COHORT_MEMBERSHIP_CHANGED: when a cohort membership update ends

Supporting information

For an overall understanding of the design, check out the Open edX Events ADRs and discussions:

1. Open edX Event naming and versioning ADR
2. Open edX Event Payload Conventions ADR
3. Community discussion about Open edX Events design
4. Community discussion about Hooks Extension Framework

Discuss on Hooks Extension Framework:
https://discuss.openedx.org/t/configuration-for-the-hooks-extension-framework/4527/

Testing instructions

1. Checkout to MJG/2nd_batch_openedx_events
2. Install Open edX Events library:
   pip install openedx-events==0.5.1
3. Connect your custom receiver to the signal as follows:

from openedx_events.learning.signals import STUDENT_REGISTRATION_COMPLETED

@receiver(COURSE_ENROLLMENT_CHANGED)
def callback(**kwargs):

Deadline

Before Maple cut.

Other information

Author's concerns

• Is the location of the events correct?

[openedx-webhooks]

Thanks for the pull request, @mariajgrimaldi! I've created BLENDED-953 to keep track of it in Jira. More details are on the BD-32 project page.

When this pull request is ready, tag your edX technical lead.

[mariajgrimaldi]

Hi there! @ormsbee @feanil @nasthagiri @felipemontoya

I hope you're having a great week! I just opened this PR with the second batch of Open edX Events and their tests. I look forward to hearing from you!

[felipemontoya]

All the events for this PR look good, data is consistent and the same is true for tests. I think we could merge this and thus complete the first 8 basic openedx events.

[edx-status-bot]

Your PR has finished running tests. There were no failures.

[felipemontoya]

@nasthagiri @ormsbee would you approve us merging this?
We just bumped the version of the openedx-events lib so that the latest changes using the send_robust signals are also included.

[felipemontoya]

Thanks a lot @mariajgrimaldi and @ormsbee. I will merge this now. Open edx events are now in the platform.

[openedx-webhooks]

@mariajgrimaldi 🎉 Your pull request was merged! Please take a moment to answer a two question survey so we can improve your experience in the future.

[edx-pipeline-bot]

EdX Release Notice: This PR has been deployed to the staging environment in preparation for a release to production.

[nasthagiri]

Congratulations!

[edx-pipeline-bot]

EdX Release Notice: This PR has been deployed to the production environment.

[edx-pipeline-bot]

EdX Release Notice: This PR has been deployed to the production environment.