Improve LibraryContext, convert tests to testUtils [FC-0062]

[bradenmacdonald]

Description

This PR simplifies some of the library code by moving libraryId into the LibraryContext. So components can be simplified like this:

... and no longer have to pass libraryId using "prop drilling".

This PR is purely a code refactor to pave the way for some changes I need to make to LibraryContext in a following PR. There are no changes to functionality. It removes 82 lines of code 😎.

This is part of my work toward #1321

Private ref: FAL-3861

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[openedx-webhooks]

Thanks for the pull request, @bradenmacdonald!

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[codecov]

Codecov Report

Attention: Patch coverage is 97.87234% with 1 line in your changes missing coverage. Please review.

Project coverage is 92.73%. Comparing base (c80483c) to head (d6edc2e).

Files with missing lines	Patch %	Lines
src/library-authoring/common/context.tsx	87.50%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1345   +/-   ##
=======================================
  Coverage   92.72%   92.73%           
=======================================
  Files        1036     1035    -1     
  Lines       19351    19293   -58     
  Branches     4037     4085   +48     
=======================================
- Hits        17944    17892   -52     
+ Misses       1343     1334    -9     
- Partials       64       67    +3     

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