PSA was monolothic, now split, with new features, like
a DB-backed partial pipeline. FB OAuth2 version also upped.

Partial pipelines don't get cleared except when necessary.
They persist for special cases like change of browser while
still mid-pipeline (i.e. email validation step).

Refactor, cleanup, and update of a lot of small things as well.

PLEASE NOTE the new `social_auth_partial` table.

- Keeps platform set default of "Audit" to be backwards compatible and not break stuff
- get COURSE_MODE_DEFAULTS from config if set

move tasks into tasks.py

add more logging

Defaults to SUPPORT_SITE_LINK intentionally.
Also fixed surrounding quality tests, and overall
quality improvements.

This also serves as a slight refactor of ENT-392.

Pulling URLs from settings allows us to rely on site configuration overrides in order to support multi-tenancy.

LEARNER-1103

Add Enterprise sidebar to login and registration views; remove unneeded fields; make registration form more narrow

This makes it possible to refer to multiple book from a single app.

This also means that Open edX branches will be able to pass bok-choy
tests (at least if the books have already been built.)

This reverts commit 65f13dde.

This reverts commit 88dd85ca, reversing
changes made to bf8aef33.

Although we are phasing out our support of OIDC, this particular feature will allow us to eliminate many of the settings we
share across services. Instead of reading various endpoints and secret keys from settings or hardcoded values, services
with the proper authentication backend can simply read (and cache) the information from this endpoint.

ECOM-3629

ENT-247

which is used for external, client-side requests by the Enterprise app to the
Enrollments API.

This allows ENTERPRISE_ENROLLMENT_API_URL to use localhost:8000, to be used for
internal, server-side requests.

Bumps edx-enterprise version to 0.27.4 to use this change.

We should not be using custom signing keys for each service at this time. We may want to return to this strategy in the future; but, this is not the direction any of our other services are going in.

ECOM-6541

ECOM-5936

This line previously departed from the convention of coalescing down to
the original value specified in `lms/envs/common.py`.

Now, the setting can fall back to its default value from `common.py`,
instead of only respecting the value loaded from JSON (or `None` if not
defined).

General good-practice cleanup requested by @jibsheet. Also includes some
pylint fixes myh editor flagged during this cleanup.

aws.py redefines the default queues in order to expose cross-environment
work. The new recalculate grades routing key shgould use that value
rather than the default defined in common.py.