Replace `check_for_get_code` with `assert_request_status_code`

More flexible, uses the word "assert", method instead of function
Added enrollment breakdown by certificate track
Refactor LMS Video Tests
Decrease Video Player Init Wait Timeout
make expanding explanation accessible

LMS-11161
Toggle aria-expanded attribute
Separated August changes into new table in chg log
Merge pull request #4715 from edx/ammar/decrease-video-player-init-timeout

Decrease Video Player Init Wait Timeout
Merge pull request #4261 from edx/ammar/video-tests-refactoring

Refactor Bok-Choy LMS Video Tests
Fix property call issue
Merge pull request #4731 from edx/ammar/fix-property-call

Fix property call issue
Catch InvalidKeyError in UserTagsEventContextMiddleware.

LMS-11189
Catch InvalidKeyError in static_tab view.

LMS-11189
Merge pull request #4678 from edx/usman/lms11189-user-api-middleware-exception-2

Catch InvalidKeyError in UserTagsEventContextMiddleware and static_tab view.
Merge pull request #4654 from edx/db/kill-check-for-code

Replace `check_for_get_code` with `assert_request_status_code`
Merge pull request #4602 from edx/db/expand-on-click-or-enter

make expanding explanation accessible
Fix inconsistent ui issues on discussion during blackout period
FOR-108
Merge pull request #4461 from mlkwaqas/waqas/for108-discussion-blackout-period-inconsistent-ui

Fix inconsistent ui issues on discussion during blackout period
Annotation Tools: Adding Loading Bar to Annotations Table

- added label below loading gif

 - fixed spacing issues

  - change the error messages in annotator code
Added link from instructor dashboard to analytics dashboard