use default cache for tests
add test for when cache isn't configured
add test for dummy cache
noop if no cache found

This is primarily to reduce load on MongoDB, where we've lately
had performance problems that we suspect are caused by very
large course structures being evicted from MongoDB's cache. This
may potentially give us a path to better performance as well,
but that's not the goal of this commit.

Surprisingly, LZ4 seemed to actually run more slowly than zlib
for this. Possibly because of some overhead in the Python
bindings? GZip was also surprisingly slow given that it uses
zlib underneath (something like 5x slower).

Use separate cache backend for caching structures.

Abstract out course structure cache.

add datadog metrics for compressed course structure sizes

Since we're using a different cache background, we don't need to have a cache prefix

Use dummy cache backend for tests.

Fallback to default cache if course_structure_cache doesn't exist.

Revert "Merge pull request #8402 from edx/sarina/annotate-middleware"

mattdrayer/ECOM-1773: Fixed invalid URL reversal

This reverts commit 09425c3d, reversing
changes made to 410b9282.

ECOM-1772 Due date issue test case fixed.

Use RequireJS Optimizer for content libraries

Remove hinting templates as 'tab:' definition fails on Split

fix problems with multi-seat purchases when accessibility review was …

I18N needs to not include the string substitution

fix price per seat

Handle whitespace-only content in discussion API

Add editable_fields to discussion API responses

Fix discussion_api to handle old threads

This will allow clients to determine what actions (e.g. following,
endorsing, and editing content) a user can take on a piece of content.

The comments service rejects whitespace-only content for certain
strings, so the discussion API should also reject such content.

MA-844 Video Upload: remove dependency on AssetMetaDataStore.

Update translations (autogenerated message)

ECOM-1673 removed class and icon to always show full upsell content.

Cleanup of third-party login and auto-enrollment

removed JavaScript function specific to the upsell toggle
removed bok choy test
Removed all referenced to toggleExpandMessage()

Treat aggregate sums of None as 0

Extended hint features

Make a11y test inherit from a base class

Update bok-choy cached db with the latest migrations

SOL-939 Jasmine Tests