Remove success banner on container state change

Add i18n to backend error messages in case they appear to end user
Remove success banner when trying to publish or discard changes on container page

Move Bug fixes

Fixed Backend: Move component directly to content experiment level (component will now be the sibling of groups)

Fixed Move button is disabled when moving components inside conditional module

Fixed When navigating upward/backward, target parent is not set correct, resulting source to be moved in the previously selected parent

Allow move for content experiment

bokchoy tests for move xblocks

- TNL-6062
- TNL-6229

TNL-6060

TNL-6047

Get ancestor info for the given xblock
- TNL-6061

Moved tagging aside xblock data save/update logic out of preview_hanlder

added test to support changes

moved aside xblock data save logic int component_handler

changes after feedback

fixed typo

[WIP] Use web fragments for discussion and static tabs

Storage-backed versioned Block Structures: Models

Ensure that course_about uses a valid course ID

[ENT-210] Remove unnecessary pipeline element; use new name for existing element

Update Peer Instruction XBlock to 0.6.2

Move more tests to use bulk_operations

LMS startup optimization: lazy load pynliner

Benp/fix tnl-6040

Related changes https://github.com/ubc/ubcpi/pull/111

Cleaner grades exception handling

pynliner imports cssutils, which has an expensive initialization. All
told, it can account for 15-20% of "fast" LMS startup (without asset
compilation). So we're going to load it locally here so that we delay
that one-time hit until we actually do the (rare) operation that is
sending a credit notification email.

PLAT-1104 Import courses asynchronously

[ENT-208] Update AWS ENTERPRISE_ENROLLMENT_API_URL variable