feat: Validation for Start time and Stop time fields

[vladislavkeblysh]

• Fixed validations for startTime and stopTime fields.

stopTime value must not be equal to 24:00:00, because this value is not valid so when the user types 23:59:59 in the startTime field and stopTime field - set the startTime field to 23:59:58.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (3aa9088) 90.49% compared to head (6604493) 90.50%.
Report is 41 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #419      +/-   ##
==========================================
+ Coverage   90.49%   90.50%   +0.01%     
==========================================
  Files         228      228              
  Lines        4115     4120       +5     
  Branches      822      823       +1     
==========================================
+ Hits         3724     3729       +5     
  Misses        370      370              
  Partials       21       21              

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[mphilbrick211]

Hi @openedx/teaching-and-learning! Would someone be able to review this for us? Thanks!

[mphilbrick211]

Hi @openedx/2u-tnl! Would someone be able to please review / merge this for us? Thanks!

[mphilbrick211]

Hi @openedx/2u-tnl! Would someone be able to please review / merge this for us? Thanks!

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