feat: add ENABLE_GRADING_METHOD_IN_PROBLEMS feature flag

[BryanttV]

Description

This PR adds the feature flag to enable the grading method feature in problems. This feature flag is used in this PR.

Important

These are the last PRs needed to add support to the MFE for the Configurable grading method for problems with multiple attempts

Supporting information

These changes are part of the effort made to implement Configurable grading method for problems with multiple attempts

Testing instructions

All instructions in this PR.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.94%. Comparing base (5247ec5) to head (0e8cd42).
Report is 1 commits behind head on master.

Additional details and impacted files

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  Coverage   91.94%   91.94%           
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  Files         571      571           
  Lines       10188    10188           
  Branches     2210     2210           
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  Hits         9367     9367           
  Misses        794      794           
  Partials       27       27           

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[mphilbrick211]

Hi @openedx/2u-tnl! This is ready for review.

[mariajgrimaldi]

LGTM! I tested turning this new feature on/off for the new problem editors, and it worked as expected (we used a quince environment).

Thank you :)

[BryanttV]

Hi @openedx/2u-tnl, Could you take a look at this PR? Thanks!
@brian-smith-tcril, @arbrandes, I don't know if you can also help me with a review, I would appreciate it very much!

[KristinAoki]

@BryanttV is this good to merge?

[BryanttV]

Hi @KristinAoki, yes, that would be perfect. Thank you!

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