Revert "Sync HPPS parent_post_id when a lesson is reassigned"

[donnapep]

Reverts #7939 based on this discussion - #7931 (comment).

[Copilot]

Pull request overview

Reverts the previously added HPPS behavior that synced sensei_lms_progress.parent_post_id for lesson progress rows when a lesson’s _lesson_course postmeta changed.

Changes:

• Removes Lesson_Course_Sync_Handler (the postmeta hook handler that updated parent_post_id for lesson progress rows).
• Removes the unit test suite that covered the handler behavior.
• Removes the associated changelog entry and a related documentation line in AGENTS.md.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
includes/internal/student-progress/services/class-lesson-course-sync-handler.php	Deletes the service that listened for _lesson_course meta changes and updated HPPS progress rows.
includes/class-sensei.php	Removes initialization/wiring of the deleted sync handler.
tests/unit-tests/internal/student-progress/services/test-class-lesson-course-sync-handler.php	Deletes unit tests that validated the sync behavior.
changelog/fix-hpps-lesson-course-sync	Removes the changelog entry that documented the added sync behavior.
AGENTS.md	Removes a testing-conventions bullet (assertion messages).

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