Use API doc tooling from its own library

ENT-2543: Added ability to add enrollment with GlobalStaff permissions

added unit test

Reviewer feedback changes

Fixed broken test

created separate const for search_index_update queue

Adds instagram and removes google-plus footer links

Removed the deprecated app_name usage from lms/urls.py BOM-1155

PROD-1178

Add way to get YouTube metadata that doesn't require a session cookie

BOM-1145 : Django 2.2 Supported version of sorl-thumbnail

Unsubscribe link added in bulk emails

BOM-1141 Upgrade social-auth-app-django

The Video Player XBlock will sometimes make API calls to /couses/yt_video_metadata, a REST API endpoint that in turn loads video metadata from YouTube using the configured settings.YOUTUBE_API_KEY.

However, in the Blockstore-based XBlock runtime, we are running XBlocks in a secure sandbox, and the user's browser cannot pass session cookies when calling REST API endpoints. So currently, the video XBlock tries to request YouTube metadata from that API endpoint, but it fails if run within such a sandbox.

The existing API also doesn't work for anonymous users (users who are allowed to see video XBlocks but who have not logged in to an LMS user account).

This commit updates the Video XBlock so that it can use a handler to load the data from YouTube instead of a generic REST API. This works well in the new runtime, because it has code to support calling handlers within the sandbox, including by anonymous users.

I also fixed a bug where on a default devstack, the endpoint will try calling YouTube using PUT_YOUR_API_KEY_HERE as an API key, and get a "bad request" error from YouTube.

The code could be re-organized by moving things around, but I've left everything as-is for now to keep the diff as small as possible.

Dont delete course overviews

Merge pull request #22876 from edx/testeng/bokchoy_auto_cache_update_e00340173c2d18e4052a08fe465230530b2d3202

Bokchoy Testing DB Cache update

Update edx-val from 1.2.0 to 1.2.1

Added the link to latest master commit of GitHub for Django 2.2 support.

Fix footer link for wcag.

BOM-1126

Awais786/bom 1050

Removing the moto.

remove the logs