feat: handle unsaved changes in text & problem editors (#1444)

[navinkarkera]

The text & problem xblock editors will display a confirmation box before cancelling only if user has changed something else it will directly go back.

(cherry picked from commit df8a65d)

Backport of #1444

[openedx-webhooks]

Thanks for the pull request, @navinkarkera!

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[codecov]

Codecov Report

Attention: Patch coverage is 94.73684% with 2 lines in your changes missing coverage. Please review.

Please upload report for BASE (open-release/sumac.master@f10ad9f). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
...ProblemEditor/components/EditProblemView/index.jsx	33.33%	2 Missing ⚠️

Additional details and impacted files

@@                     Coverage Diff                      @@
##             open-release/sumac.master    #1470   +/-   ##
============================================================
  Coverage                             ?   93.17%           
============================================================
  Files                                ?     1054           
  Lines                                ?    20506           
  Branches                             ?     4376           
============================================================
  Hits                                 ?    19107           
  Misses                               ?     1336           
  Partials                             ?       63           

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