feat: Assignment and course grade fields validations (redwood.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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[mphilbrick211]

Hi @vladislavkeblysh! A few branch conflicts have popped up.

[mphilbrick211]

Hi @vladislavkeblysh! A few branch conflicts have popped up.

Hi @vladislavkeblysh - friendly ping on this!

[vladislavkeblysh]

@mphilbrick211 done!

[farhaanbukhsh]

@vladislavkeblysh there are still conflicts and tests failing can you please resolve them :) I can review it then :)

[farhaanbukhsh]

Based on #366