Run Pyupgrade on student folder. 

BOM-2351: Removed unused imports from common/lib/{capa, safe_lxml, sy…

Check course outline and course date toggles in addition to courseware toggle for streak

AA-682: Update the pseudo session fallback session

There was a bug where the earliest course returned for a pseudo session
(when there were no available sessions) might not exist in modulestore and
would cause a 500 error. The data problem is another issue that will need to
be fixed, but by switching to the most recent session in this scenario, we believe
we will reduce the likelihood of this error occurring. We also believe the most
recent session is a better return value than the first ever session.

* refactor: ran pyupgrade on lms/djangoapps/bulk_enroll
Co-authored-by: M. Zulqarnain <muhammad.zulqarnain@arbisoft.com>

BOM-2351: Removed unused imports from common/djangoapps/{track, util}

Ran pyupgrade on lms/djangoapps-I

The requirements/edx/private.txt file is for dev's own private package
needs.  There are two installation mechanisms in edx-platform, and
neither handled the file properly:

- `paver install_prereqs` had the wrong file name.  The file was moved
  almost three years ago, and paver wasn't kept up.

- `make requirements` used `private.*` which included private.in, which
  pip-sync balks at.

AA-513: Updating to segment instead of backend event

[TSD] add annotations for DISPLAY_HISTOGRAMS_TO_STAFF feature flag

[TSD] Added annotations for EMBARGO feature flag

* Commits:
  docs: Update references to Django MIDDLEWARE_CLASSES

AA-513: Add segment event for logout

AA-684: expose can_load_courseware to Course Home MFE

BOM-2351: Removed unused imports from common/djangoapps/student

BOM-2351: Removed unused imports from common/test

BOM-2351: Removed unused imports from common/djangoapps/{course_modes…

Revert http-pretty it seems few tests becomes flaky.

Ran pyupgrade on lms/djangoapps

* LEARNER-8158
Fixed completion param issue
- There is a case where we are sending requested_fields in params as comma separated list
e.g. requested_fields=children,show_gated_sections,graded,special_exam_info,completion.
- We didn't test for this case in first place and test cases were sending requested_fields as list.
- Now we can also handle this comma separated completion field which was getting ignored before.

Upgrading mock package.

* Commits:
  fix: Upsize LTI Discussions iframe, 400px -> 800px

As code was already updated (~1 year ago) in #23070.
A first attempt was made in #18342, which can now be closed.

References: https://github.com/edx/edx-platform/pull/23070
References: https://github.com/edx/edx-platform/pull/18342

Otherwise, there's too much scrolling.

Fixes: https://openedx.atlassian.net/browse/TNL-7996

* Commits:
  refactor: Convert discussions to pluggable app