ENT-4789

commits
=======
- fix(ci): move github workflow to correct location

feat: Add CertificateDateOverride model

Add a new model (and corresponding migration) to the certificates
app in the LMS: CertificateDateOverride. The model will eventually be
used to allow course teams / support to override the "Issued On" date
for a given course certificate.

I used Github's UI to create this from the template (which I _never_ do,
instead opting for the CLI) and some how this ended up in the project
root, instead of in the .github/workflows directory. 

Back to the command line for me...

chore: upgrade edx-name-affirmation to 0.3.0

refactor!: Remove `generate_example_certificates` and update Instructor Dashboard with updated messaging.

refactor!: Remove `generate_example_certificates` and update Instructor Dashboard with updated messaging.

[MICROBA-1087]
[DEPR-155]

* Remove `generate_example_certificates` functionality
* Adjust Instructor dashboard slightly to prevent people from clicking the `Generate Example Certificates` button, remove form/code that called the `generate_example_certificates` endpoint.

fix: don't recreate course overview images every request

MICROBA-678

maint: bumping enterprise version to 3.27.12

This reduces database churn and helps avoid locks.

fix: wrong start date is displayed in susbection modal

feat: reimagine certificate display settings

The course settings `certificate_available_date` (CAD) and
`certificates_display_behavior` (CDB) were previously
acting indedependantly of one another. They now work in
tandem. This change:
- limits CDB to a dropdown
- removes "early_with_info" and adds "end_with_date"
- only takes CAD into account if "end_with_date" is selected
- Moves CDB to the main course schedule settings page
- updates CourseOverview model and CourseDetails objects to
validate these fields and choose sane defaults if they aren't
expected values

This work was previously done in bd9e7dd (complete with bugs), so this
version is toggleable via the ENABLE_V2_CERT_DISPLAY_SETTINGS setting

Formerly, bulk management was enabled by sending feature feature
toggle to Gradebook which also checked for the presence of a 
master's track to enable the feature. This default enables for all
courses with a master's track and also allows selective enabling 
for courses with the feature flag.

MICROBA-1410

chore: Removed constraint on django-countries

chore: Django3 has removed python_2_unicode_compatible.

Translate prerequisite section banner text

fix: wrong start date is displayed in susbection modal with xblock's start date so use course context's start date (AA-945)

Execute the codemodes.

feat: enable effort estimation feature by default

fix: display relative due date on limited time assignments (AA-943)

This model has been replaced by the CertificateAllowlist.

MICROBA-1304

chore: Django3 has removed python_2_unicode_compatible.

* feat: Celery tasks instead of synchronous emails for enrollment, in notify_enrolled_learners()

ENT-4779

ENT-4779

* feat: use edx-enterprise 3.27.11 for improved error handling in email notify task

With Badgr v2 API, notification emails for earning badges are
no longer sent to learners by default. However, the request to
create a badge assertion accepts an optional boolean property
"notify", that can be used to enable/disable email notifications.

Make it configurable by an optional setting `BADGR_ENABLE_NOTIFICATIONS`
(defaults to False).

[OSPR-5796] [BB-2862] "LANGUAGE_CODE" site configuration option

disable subframe dialog suppression for sites which use ENV_TOKENS for config.

feat: log event for custom pacing when user submits relative date for self paced course (AA-921)

This model has been replaced by the CertificateAllowlist.

MICROBA-1304

Execute the codemodes.