test: Remove unit test performance tests

[philipphofmann]

Performance unit tests require baseline profiles bound to an exact machine configuration, which we can't generate for CI. Thus, the performance tests run without any benefit in CI. We can remove them with this PR.

#skip-changelog

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 90.657%. Comparing base (c379c5e) to head (d1a0630).

Additional details and impacted files

@@              Coverage Diff              @@
##              main     #3939       +/-   ##
=============================================
- Coverage   90.663%   90.657%   -0.006%     
=============================================
  Files          581       582        +1     
  Lines        45434     45492       +58     
  Branches     16169     16201       +32     
=============================================
+ Hits         41192     41242       +50     
- Misses        4172      4180        +8     
  Partials        70        70               

Files	Coverage Δ
...ance/FramesTracking/SentryFramesTrackerTests.swift	99.491% <ø> (-0.011%)	:arrow_down:
...tryTests/Networking/SentryHttpTransportTests.swift	96.598% <100.000%> (-0.052%)	:arrow_down:
Tests/SentryTests/SentryScopeSwiftTests.swift	99.074% <ø> (-0.030%)	:arrow_down:

... and 23 files with indirect coverage changes

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