feat: add audit instrumentation for cancel remind and redeem

[gshivajibiradar]

PR Title

feat: audit instrumentation for cancel, remind and redeem

PR Description

Implements audit instrumentation for the cancel, remind, and learner redemption flows in enterprise-access.

The changes ensure audit action records are created with the correct actor attribution and source for admin-initiated and learner-initiated operations.

Changes

• Added audit action recording for content assignment cancellation.
• Added audit instrumentation for reminder flows.
• Propagated admin actor identity through the async reminder Celery task.
• Added audit instrumentation for learner redemption.
• Added the appropriate actor type, LMS user ID, learner information, and action source.
• Added/updated tests covering the new audit paths.

Testing

• 2122 tests passed
• 37 tests skipped
• Overall code coverage: 88%
• Patch/diff coverage: 100%
• 18 changed lines covered
• 0 missing lines

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 87.64%. Comparing base (54d4349) to head (89bbb55).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #272   +/-   ##
=======================================
  Coverage   87.64%   87.64%           
=======================================
  Files         157      157           
  Lines       13450    13454    +4     
  Branches     1303     1303           
=======================================
+ Hits        11788    11792    +4     
  Misses       1359     1359           
  Partials      303      303           

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[Copilot]

Pull request overview

This PR adds audit instrumentation to content-assignment cancellation, reminder, and learner redemption flows so that assignment action rows capture actor attribution (admin vs learner vs system) and request source across sync and async boundaries.

Changes:

• Writes CANCELLED audit actions synchronously in cancel_assignments() with admin actor attribution, decoupling audit from best-effort async email notification.
• Propagates actor attribution through the reminder Celery task and records it on REMINDED actions.
• Records learner actor attribution/source/customer UUID on REDEEMED actions (success + failure) and adds/updates tests for these paths.

Critical / high-severity issues to address:

• The cancel-email Celery task still writes an errored CANCELLED action on failure via SendCancelEmailTask.add_errored_action, which can now create duplicate/misleading CANCELLED audit rows (one “successful cancel” from the API + one “email_error cancel” from the task) and the errored row currently lacks the new audit fields.
• Reminder task failure path currently drops actor attribution (success path passes actor fields, but on_failure() does not), so errored REMINDED actions will be attributed to SYSTEM unless fixed.

Reviewed changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
enterprise_access/apps/subsidy_access_policy/tests/test_models.py	Extends redemption tests to assert learner actor attribution/source/customer UUID on REDEEMED actions.
enterprise_access/apps/subsidy_access_policy/models.py	Passes learner actor attribution/source into redeemed action creation (success + error).
enterprise_access/apps/content_assignments/tests/test_tasks.py	Adds tests ensuring reminder task preserves actor attribution and defaults safely when omitted.
enterprise_access/apps/content_assignments/tests/test_api.py	Adds tests for cancel/remind API helpers to ensure actor attribution is passed/written correctly.
enterprise_access/apps/content_assignments/tasks.py	Updates reminder task signature to accept actor attribution and records it on success; removes duplicated success-cancel action write in cancel-email task body.
enterprise_access/apps/content_assignments/models.py	Extends action helper methods to store actor attribution/source/customer UUID + metadata for reminded/redeemed/cancelled actions.
enterprise_access/apps/content_assignments/api.py	Writes CANCELLED audit actions synchronously during bulk cancellation; propagates actor attribution into reminder task payload.
enterprise_access/apps/api/v1/views/content_assignments/assignments_admin.py	Passes admin actor attribution/source from DRF view into cancel/remind APIs.
enterprise_access/apps/api/v1/tests/test_assignment_views.py	Updates view tests to assert actor attribution is passed into reminder task calls.

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