* ENT-2294 | Moving utility functions in program enrollments to places related to the data they manipulate

* updating a mock path

* minor test fix

Awais786/bom 584

BOM-581

awais786/bom 594

PROD-687

BOM-457

test fixes

python 3 fixes

minor fixes

python 3 fixes

quality fixes

quality fixes

EDUCATOR-4670 - pr 1 - remove usage of persistsubsectionoride history

Merge pull request #21739 from edx/emma-green/REV-970/enterprise-users-should-not-get-first-purchase-discount

enterprise users should not get the first purchase discount

Making the regex that gets the index courses more secure

remove unused param

Rename cookie-policy-banner to frontend-component-cookie-policy-banner

BOM-736

This reverts commit af4e7a34.

After merging the above commit, I was seeing 'internal-error's
on Stage in responses to the Registrar API. I am temporarily
reverting it until I can figure out a fix.

quality fixes

python 3 fixes

quality fixes

BOM-724

Python3 fix.

Python3 fix.

BOM-637

Awais786/bom 482

Management command to add history to course_overviews_courseoverview.

Fixing python3

use the specified user from the parameter to determine if the flag is…

This commit completes the program_enrollments LMS app
Python API for the time being. It does the following:
* Add bulk-lookup of users by external key in api/reading.py
* Add bulk-writing of program enrollments in api/writing.py
* Move grade-reading to api/grades.py
* Refactor api/linking.py to use api/writing.py
* Refactor signals.py to use api/linking.py
* Update rest_api/v1/views.py to utilize all these changes
* Update linking management command and support tool to use API
* Remove outdated tests from test_models.py
* Misc. cleanup

EDUCATOR-4321

BOM-314

BOM-376

Fixing python3

Python Requirements Update