Migrate from FluentAssertions to AwesomeAssertions

[JamieMagee]

AwesomeAssertions is a community fork of FluentAssertions which retains the open source Apache 2.0 license.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.3%. Comparing base (5307e08) to head (424c83a).
⚠️ Report is 8 commits behind head on main.

Additional details and impacted files

@@          Coverage Diff          @@
##            main   #1518   +/-   ##
=====================================
  Coverage   90.3%   90.3%           
=====================================
  Files        418     418           
  Lines      35275   35275           
  Branches    2188    2188           
=====================================
+ Hits       31881   31882    +1     
  Misses      2951    2951           
+ Partials     443     442    -1     

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