EDUCATOR-793: converts TypeError,NotFoundError logging to debug only

LEARNER-1604: Change default and refactor old unified_course_view flag.

Enqueue Generate Certs Task on Passing Grade

Merge pull request #15223 from proversity-org/proversity/pr-add-invitation-only-field-to-course-serializer

Add invitation_only field to course serializer

Remove deprecated django.utils.importlib

Correct spelling of 'Open edX', and pedantic typography in the copyright footer

fixing color contrast issues in studio

PLAT-1597 Fix test mongo cleanup hostname in Docker devstack

This includes several general enhancement in addition
to the fixes for unified_course_view:
1. Add support for default when no waffle flag defined.
2. Add support for table_blacklist to assertNumQueries.
3. Rename flag to 'course_experience.course_outline_page'.
4. Change flag default to True when it is not defined.

PLAT-1610 Fix social auth config error in Docker bok-choy tests

PLAT-1323 Remove older, slower code path for course export

AC-727
began changing colors in course content, files and uploads, and when creating a course

finished fixing contrast issues on files and uploads page

fixed advanced settings and issue with hovering in files and uploads

fixed color issues in studio home page and when hovering

fixed contrast in updates, pages, textbooks, and group configurations

fixed issues when configuring a section of a course in course outline

fixed hovering colors to make contrast more visible

fixed colors on the green button

AC-727

Ibrahimahmed443/wl 1078 program details changes

This endpoint allows the Rapid Experiments Team to quickly update data for multiple learners.

Refactor heartbeat endpoint for extensibility

Upgrade django-pyfs to 1.0.6

ENT-447 Add flag to third party auth SAML provider to send to the registration page first

catch InvalidKeyError

Add optional support for Unicode usernames

We may want to add additional heartbeat checks, particularly depending
on the context (e.g. different environments). This is meant to be a
start at enabling a more plug-in style heartbeat check that provides
more detailed diagnostics if desired.

Use the right helper function for finding course upgrade price for th…

Refactoring: Use format with named variables

Only display updates course tool when updates exist.

Created new embargo check api