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[TSD] adds annotations for XBLOCK_SETTINGS

[TSD] add toggle annotations for DEFAULT_MOBILE_AVAILABLE

AA-568: fix start course bug

[BB-3306] Customizable Certificate Date Format

* Commits:
  fix: Fix KeyError in vertical_block

Upgrade edx-enterprise to 3.17.12 | Conditionally allows the deletion of individual EnterpriseCourseEnrollment and related LicensedEnterpriseCourseEnrollment records via the Django Admin site, so that site admins can manually delete enterprise enrollments that were created in error.
This is only allowed if a Django settings feature flag is set to True.

This now mimics the way this is (safely) done in the sequence module [1].

References:
- [1] https://github.com/edx/edx-platform/blob/5f94a082ce1141d9214e83c152baa00186278ad3/common/lib/xmodule/xmodule/seq_module.py#L657-L658

Define a ALLOW_ADMIN_ENTERPRISE_COURSE_ENROLLMENT_DELETION feature flag, so that site admins are allowed to delete EnterpriseCourseEnrollment records.

add PR template

- Use different attribute names for new and old versions of function
- Use a shorter name overall (for ease of analysis)
- Add monitor for fetched-existing case
- Only record computed-stored if `get_or_create` succeeds, but also
  break it into created vs. fetched cases by checking return value
- Correct name of monitor in `except` clause -- that should only happen
  for a race inside `get_or_create` itself. There's a different race in
  the `anonymous_uid_for_user` between fetch and compute/save.
- Other name tweaks

ARCHBOM-1674

Adding collected structure to the course grade read

- Make it easier to rotate `SECRET_KEY` by documenting this usage
  for both sensitivity and rotation process. (ARCHBOM-1676).
- Just use a hash of the secret rather than HMAC + MD5. We're not
  authenticating a message, so HMAC isn't really needed -- it just needs
  to be unique, deterministic, and irreversible. SHAKE allows generation
  of an arbitrary length hash without needing to truncate.

Also, rename tracking session ID generator for clarity -- there's no
encryption happening here.

Add additional test for existing claim of uniqueness.

* import task decorator from celery APP instance instead of celery package in CMS

* replaced task decorator with shared_task in cms and common

* Fixed import of shared_task

* Fixed import

These changes were initially made to make it easier to do SECRET_KEY rotations.  Along the way, we found it made sense to refractor the code as well.

Changes made:
- changed get_to_create to create because now the code should only get to this block when a write is necessary
- added a lookup for anonymous_user_id. This is to return an existing anonymous_user_id rather than calculating. This will mitigate the results of SECRET_KEY rotation.
- Added monitoring to help us make better decisions: should we not sue SECRET_KEY, performance considerations...
- put old function behind toggle in case something goes wrong in production with new code
- refractoring function structure for better understanding

* changed instructor dashboard waffle type form course to legacy

added required annotations, detailed description and some nit

added extra space for the toggle_description

[BD-04] [SE-3708] Convert HiddenDescriptor to an XBlock. 

[BD-21] Fix `ERROR_ON_DEPRECATED_EDX_PLATFORM_IMPORTS` code annotation

For ARCHBOM-1674 we need more information on how often save=False is
actually used vs. other code paths.

[TSD] adds annotations for XBLOCK_RUNTIME_V2_EPHEMERAL_DATA_CACHE

This annotation was causing a linting failure, and a TypeError down the road in
the feature toggle report processing step by
edx-toggles/scripts/feature_toggle_report.py.

Co-authored-by: Ned Batchelder <ned@nedbatchelder.com>

Provide logo URL from the backend

Python Requirements Update