TNL-4973

TNL-4972

TNL-5014

FEDX-176

TNL-5057 This un-actionable error is polluting the stream of devops pages, and
should be quieted. A longer term fix will be made in TNL-5245.

Small changes to the grades djangoapp
    -sets up mock_get_score context handler
    -fixes an issue with not invalidating lazy scores property
    -code quality fixes
    -query count optimization in PersistentSubscetionGrade.create
    -adds atomic blocks to avoid IntegrityErrors corrupting an entire request

Hooks the pre-existing grades code into our new PersistentSubsectionGrade data
model. Includes test updates, and some minor changes to the data model that
were discovered in testing.

small fix for align text and radio/checkbox

alinged checbox and radio inputs.

create silent class for Choice Text Group

clean up

change px to em

TNL-4826

ECOM-4890

Adds ENABLE_SUBSECTION_GRADES_SAVED feature flag to both lms and cms. Also
installs the wiring that will allow robust grades to be used for courses
that enable it. This functionality is still gated by the feature flag
and should not be used until the remaining robust grades work is finished.