fix(launch profiling): debug logs and cleanup

[armcknight]

Follows #3634 and followed by #3636

Remove some global variables that are no longer needed now that we use a dedicated transaction for app launch.

Remove some old API from the backup config file strategy we no longer use. It was causing some build failures in tests.

Also some debug logs that were helpful to me.

#skip-changelog

[github-actions]

Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	1229.15 ms	1251.14 ms	21.99 ms
Size	21.58 KiB	422.62 KiB	401.04 KiB

Previous results on branch: armcknight/feat/launch-profiling5-cleanup

Startup times

Revision	Plain	With Sentry	Diff
4916322	1211.00 ms	1220.00 ms	9.00 ms
b4dffe4	1205.65 ms	1222.49 ms	16.84 ms

App size

Revision	Plain	With Sentry	Diff
4916322	21.58 KiB	422.53 KiB	400.95 KiB
b4dffe4	21.58 KiB	422.53 KiB	400.95 KiB

[armcknight]

UI test TopViewControllerTests.testPagesViewController() failed in asan, reran it

[armcknight]

Two unit tests failing:

• SentryCrashInstallationReporterTests.testReportIsSentAndDeleted()
• -[SentryCrashReportStore_Tests testPruneReports]
  rerunning those

[brustolin]

Looks good.

[philipphofmann]

LGTM

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (775818a) 89.189% compared to head (54c5990) 89.167%.

Additional details and impacted files

@@                                   Coverage Diff                                    @@
##           armcknight/feat/launch-profiling4-end-to-end-check     #3635       +/-   ##
========================================================================================
- Coverage                                              89.189%   89.167%   -0.022%     
========================================================================================
  Files                                                     532       532               
  Lines                                                   58672     58659       -13     
  Branches                                                21044     21046        +2     
========================================================================================
- Hits                                                    52329     52305       -24     
- Misses                                                   5303      5309        +6     
- Partials                                                 1040      1045        +5     

Files	Coverage Δ
Sources/Sentry/SentryProfiler.mm	78.205% <100.000%> (+1.282%)	⬆️
Sources/Sentry/SentryTracer.m	96.309% <ø> (+0.664%)	⬆️
Sources/Sentry/Profiling/SentryLaunchProfiling.m	62.962% <0.000%> (+2.248%)	⬆️

... and 11 files with indirect coverage changes

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