Convert masquerade UI widgets to Function Components + TypeScript

[bradenmacdonald]

The masquerade UI widget:

... is using old-fashioned class-based components and JavaScript. In this PR I have modernized it, converting it to TypeScript and Function Components.

There should be no changes to the functionality, but the code should be much easier to understand.

[openedx-webhooks]

Thanks for the pull request, @bradenmacdonald!

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[bradenmacdonald]

@farhaanbukhsh could you please review this?

[codecov]

Codecov Report

Attention: Patch coverage is 90.90909% with 10 lines in your changes missing coverage. Please review.

Project coverage is 89.76%. Comparing base (98c670a) to head (c6dd302).

Files with missing lines	Patch %	Lines
...tor-toolbar/masquerade-widget/MasqueradeWidget.tsx	88.63%	5 Missing ⚠️
...olbar/masquerade-widget/MasqueradeWidgetOption.tsx	83.87%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1513      +/-   ##
==========================================
+ Coverage   89.25%   89.76%   +0.51%     
==========================================
  Files         318      319       +1     
  Lines        5565     5559       -6     
  Branches     1377     1388      +11     
==========================================
+ Hits         4967     4990      +23     
+ Misses        582      553      -29     
  Partials       16       16              

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

[farhaanbukhsh]

@bradenmacdonald will do and I am willing to make these changes in Gradebook MFE but I am wondering who can review these?

[bradenmacdonald]

@farhaanbukhsh I'm not sure who maintains the gradebook MFE, but I'm always happy to review TypeScript conversion PRs and I'm a Core Contributor on any frontend repos including all MFEs.

[farhaanbukhsh]

I'm not sure who maintains the gradebook MFE, but I'm always happy to review TypeScript conversion PRs and I'm a Core Contributor on any frontend repos including all MFEs.

I am the one maintaining it but I need someone who can review those changes :) thanks a lot for the help.

[farhaanbukhsh]

@bradenmacdonald would it be possible to pass patch coverage, there are a few conditionals that can be tested, and it will be good to have, otherwise it looks good.

[bradenmacdonald]

@farhaanbukhsh Ah, right. I was planning to come back and improve the coverage but kept procrastinating. Now I've added some more tests and got the patch coverage up. I had to make some unrelated cleanups in a few other places/tests at the same time. Please check it out and let me know if this is good to merge!