Re-add reverted app startup changes

[bidetofevil]

Goal

Add back all the app startup changes that were reverted before 7.2 was cut

[github-actions]

Dependency Review

✅ No vulnerabilities or license issues or OpenSSF Scorecard issues found.

OpenSSF Scorecard

Package	Version	Score	Details

Scanned Files

[bidetofevil]

• Hook up API to allow manual app start trace ending #1957
• Give startup trace spans and attributes better names #1949
• Support manual ending of an app startup trace #1948
• Simplify logic to record app startup traces #1946
• Start app start up root span early to detect terminations #1944
• Re-add reverted app startup changes #1964 👈 (View in Graphite)
• main

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[codecov]

Codecov Report

Attention: Patch coverage is 81.81818% with 2 lines in your changes missing coverage. Please review.

Project coverage is 85.25%. Comparing base (1199365) to head (44c1642).

Files with missing lines	Patch %	Lines
...rnal/session/lifecycle/ActivityLifecycleTracker.kt	0.00%	1 Missing ⚠️
...internal/capture/startup/AppStartupTraceEmitter.kt	66.66%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1964      +/-   ##
==========================================
- Coverage   85.27%   85.25%   -0.03%     
==========================================
  Files         483      482       -1     
  Lines       11261    11235      -26     
  Branches     1689     1681       -8     
==========================================
- Hits         9603     9578      -25     
- Misses        905      906       +1     
+ Partials      753      751       -2     

Files with missing lines	Coverage Δ
...id/embracesdk/internal/registry/ServiceRegistry.kt	100.00% <ø> (ø)
...nternal/capture/startup/AppStartupDataCollector.kt	85.71% <100.00%> (+1.09%)	⬆️
...racesdk/internal/capture/startup/StartupTracker.kt	91.48% <100.00%> (+1.01%)	⬆️
...cesdk/internal/injection/ModuleInitBootstrapper.kt	90.25% <ø> (-0.04%)	⬇️
...rnal/session/lifecycle/ActivityLifecycleTracker.kt	89.47% <0.00%> (-1.84%)	⬇️
...internal/capture/startup/AppStartupTraceEmitter.kt	81.81% <66.66%> (-0.21%)	⬇️

... and 2 files with indirect coverage changes