FC-0001: switch from FutureCourseWaffleFlag to CourseWaffleFlag

[dyudyunov]

Use the updated CourseWaffleFlag.
FutureCourseWaffleFlag will be removed from the platform.

This is a part of openedx/public-engineering#28

[openedx-webhooks]

Thanks for the pull request, @dyudyunov! I've created OSPR-6661 to keep track of it in JIRA, where we prioritize reviews. Please note that it may take us up to several weeks or months to complete a review and merge your PR.

Feel free to add as much of the following information to the ticket as you can:

• supporting documentation
• Open edX discussion forum threads
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Please let us know once your PR is ready for our review and all tests are green.

[codecov]

Codecov Report

Merging #1855 (24c7302) into master (ebd41ec) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #1855   +/-   ##
=======================================
  Coverage   94.95%   94.95%           
=======================================
  Files         153      153           
  Lines       17014    17014           
  Branches     1875     1875           
=======================================
  Hits        16155    16155           
  Misses        643      643           
  Partials      216      216           

Flag	Coverage Δ
unittests	94.95% <100.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
openassessment/__init__.py	100.00% <100.00%> (ø)

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[natabene]

@dyudyunov Thank you for your contribution. Is this ready for our review?

[dyudyunov]

@natabene yes

[robrap]

Looks good. I'll approve/merge/publish once the edx-platform change has gone through. Thank you.

[dyudyunov]

rebased on master

[openedx-webhooks]

@dyudyunov 🎉 Your pull request was merged! Please take a moment to answer a two question survey so we can improve your experience in the future.

[robrap]

@mattcarter @jansenk @leangseu-edx: Thanks for the approvals and merge. This PR has a dependency on openedx/edx-platform#30351, which is working its way to Stage now. If the edx-platform change were reverted, this upgrade would break edx-platform.