REFACTOR: Migrate Networking tests to Swift Testing

[adamayoung]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 90.00000% with 4 lines in your changes missing coverage. Please review.

Project coverage is 89.44%. Comparing base (9ab06cd) to head (33080db).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
Sources/TMDb/Networking/TMDbAPIError.swift	90.00%	4 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #193   +/-   ##
=======================================
  Coverage   89.43%   89.44%           
=======================================
  Files         203      204    +1     
  Lines        2820     2860   +40     
=======================================
+ Hits         2522     2558   +36     
- Misses        298      302    +4     

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