INCR-164: Run python-modernize on common/djangoapps/microsite_configuration [backends, management, migrations] (#20507)

* INCR-145: Run python-modernize on openedx/core/djangoapps/contentserver

* INCR-145: [FIXED] line over length limit

* INCR-145: [ADD] Missing whitespace

* INCR-160: Run python-modernize on openedx/core/djangoapps/verified_track_content

* INCR-160: [FIX] line over length limit, datetime - pytz import

Upgrade edx-enterprise to 1.5.0.

* INCR-166 Run python-modernize on openedx/core/djangolib

* INCR-166 disabled harmless errors and added docstring

* INCR-159 Run python-modernize on openedx/core/djangoapps/zendesk_proxy

* INCR-159 added docstring and disabled spurious import error

*  incr-178: ran modernize on openedx/features/content_type_gating

* removed unused imports

* ran isort on openedx/features/content_type_gating/migrations

* INCR-146: Run python-modernize on openedx/core/djangoapps/cors_csrf

* INCR-146: Disable pylint warning for import-error

Re-adding django-simple-history for CourseEnrollment

* INCR-154: Run python-modernize on openedx/core/djangoapps/dark_lang

* INCR-154: Grouping for absolute_import and unicode_literals at migrations

* INCR-229 ran modernize on common/lib/xmodule/xmodule/[a-g]*.py except for graders.py

* fix a couple xss-commit-linter issues

Merge release back to master

README change

* incr-172

* incr-177 run modernize

* fixed bug due to running modernize

* move python 2 to 3 djangoapps user_api accounts

* fix import and pylint issues

* refactor translation error string in user_api.accounts.utils

Revert "Fix the unpredictable order randomization issue with randomized content blocks"

ran modernize and isort on openedx/core/djangoapps/header_control and
openedx/core/djangoapps/session_inactivity_timeout

* Run python-modernize on common/test/acceptance/tests/lms

* Fix code quality issues

* tweak mport order

REVEM-239 Add audit access expiration deadline to user-metadata

Favicon icon fixed for studio.

added logs for more information