feat: adjusted grade field validation

[dyudyunov]

Description

Added simple validation for the "Adjusted grade" field in the "Edit Grades" popup:

• allow only a numeric value
• define the minimum value (0)
• checking the correctness of the entered possibleGrade value

Notes

This was already merged in nutmeg and maple, but the PR to the master branch wasn't open at that time.

The same PR was opened for the master branch #382

Steps to reproduce

1. Go to Instructor -> Student admin -> View Gradebook
2. Click on any user
3. In the Adjusted grade field fill in symbols, letters, a large number

Behaviour before the fix

Entering the large number has no errors and it's possible to save the incorrect value:

Entering text/special symbols results in 500 errors for the request:

[openedx-webhooks]

Thanks for the pull request, @dyudyunov!

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (ba9fb37) 94.98% compared to head (3565486) 95.02%.
Report is 1 commits behind head on open-release/quince.master.

Additional details and impacted files

@@                      Coverage Diff                       @@
##           open-release/quince.master     #381      +/-   ##
==============================================================
+ Coverage                       94.98%   95.02%   +0.03%     
==============================================================
  Files                             140      140              
  Lines                            1356     1366      +10     
  Branches                          264      269       +5     
==============================================================
+ Hits                             1288     1298      +10     
  Misses                             60       60              
  Partials                            8        8              

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[farhaanbukhsh]

@mphilbrick211 I can help with review on this PR.

[mphilbrick211]

@mphilbrick211 I can help with review on this PR.

Thank you, @farhaanbukhsh!

[farhaanbukhsh]

@mphilbrick211 I will try to review the PR against master and then come back to this.