feat: Assignment and course grade fields validations (quince.master)

[vladislavkeblysh]

• Added min max validations to assignments grade fields
• Added validations when min value must be less than max value

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Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## open-release/quince.master #367 +/- ## ============================================================= Coverage ? 95.05% ============================================================= Files ? 140 Lines ? 1375 Branches ? 274 ============================================================= Hits ? 1307 Misses ? 60 Partials ? 8 ```

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[mphilbrick211]

Hi @openedx/content-aurora! This is ready for review/merge after the Master is all set.

[farhaanbukhsh]

@mphilbrick211 @arbrandes can I take this review?

[mphilbrick211]

@mphilbrick211 @arbrandes can I take this review?

Hi @farhaanbukhsh! Please do!

[farhaanbukhsh]

@mphilbrick211 reviewing the one against master.