- directly call python native APIs from forum v2 for pin, unpin thread,
commentables count_stats and get user's data by user_id
- add forum to the edx-platform requirements

- directly call python native APIs from forum v2 for get parent comment,
create parent comment and create child comment.
- rename retrieve_commentables_stats method to get_commentables_stats and
retrieve_user to get_user.

- refactored code and now pass proper parameters to python native APIs
instead of a single dict

- get_user API tests are now passing in test_views.py and test_serializers.py
- add get_user api patch in all tests
- fix httppretty request count in some tests
- fix test_patch_read_non_owner_user test

- add `ENABLE_FORUM_V2` course waffle flag to switch between old code i.e.
cs_comment_service and new code i.e. forum v2.
- mock course waffle flag is_enabled method i.e. ENABLE_FORUM_V2.is_enabled(),
so that old unit tests can be run and passed.
- refactor code(that parts of code whose native APIs are implemented till now)
where we call the native APIs

- run `make compile-requirements forum`. Error: It appears that the
Python dependencies in this PR are inconsistent: A re-run of
`make compile-requirements` produced changes.
- fix quality checks

- fix new tests related to discussion that failed after fixing previous tests
these are failing due to no.of argument difference
https://github.com/openedx/edx-platform/actions/runs/11069160532/job/30756121710?pr=35490

- migrate following native APIs i.e. mark_thread_as_read, create_subscription,
delete_subscription, update_thread_votes, update_comment_votes, delete_thread_vote,
delete_comment_vote, get_user_threads, retire_user, update_username,
get_user_course_stats, update_users_in_course, flag/unflag comment/threads
from forum v2 to edx-platform
- refactor some code

in this commit:
- migrated the tests for native APIs from test_serializers to test_serializers_native_views file.
- tests from test_views to test_views_native_views is still in progress
- fixed edx-platform tests which were failing after we added get course_id APIs
- fixed course_key error for user's retrieve APIs

- Before resolving course_id availability issue for all APIs to be used in
CourseWaffle flag, only 4 files tests were failing, We fixed those.
Now due to latest fixes, some more tests were failing that uses v1, this PR will
fix those issues.

course_id is needed to be used in second coursewaffle flag