tests: change test coverage targets to Sentry and SentrySwiftUI

[philprime]

According to the Codecov reports we are collecting coverage data about the test files, rather than only the framework.

This PR should reduce the collected code coverage to the targets Sentry and SentrySwiftUI.

#skip-changelog

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.693%. Comparing base (5d745fd) to head (aa66c1d).
Report is 9 commits behind head on main.

Additional details and impacted files

@@              Coverage Diff              @@
##              main     #4976       +/-   ##
=============================================
+ Coverage   92.434%   92.693%   +0.258%     
=============================================
  Files          669       672        +3     
  Lines        79230     82102     +2872     
  Branches     28656     29809     +1153     
=============================================
+ Hits         73236     76103     +2867     
- Misses        5896      5900        +4     
- Partials        98        99        +1     

see 24 files with indirect coverage changes

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