Revert "chore(deps): bump @testing-library/react to v14 (#1515)"

[jinlee93]

Summary:

• was getting a bunch of error messages about state updates not being wrapped in act after bump to v14
  
• reverts so these are gone
  
• also sneaks in moving mocks to test blocks b/c for some reason those were logging error messages in the console too

testing-library/user-event#1104

Test Plan:

• Wrote automated tests
• CI tests / new tests are not applicable
• Manually tested my changes, but I want to keep the details secret
• Manually tested my changes, and here are the details:
  • Create an alpha publish and try out in edu-stack or traject as a sanity check if changes affect build or deploy, or are breaking, such as token changes, widely used component updates, hooks changes, and major dependency upgrades.

[codecov]

Codecov Report

Merging #1523 (05e6f28) into next (bc21f85) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             next    #1523   +/-   ##
=======================================
  Coverage   91.97%   91.97%           
=======================================
  Files         284      284           
  Lines        4300     4300           
  Branches      793      793           
=======================================
  Hits         3955     3955           
  Misses        320      320           
  Partials       25       25           

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