fix: prevent redundant native exceptions on Android/CoreCLR

[jpnurmi]

Note

Depends on getsentry/sentry-native#1613

Fixes duplicate native exceptions (#3954) on Android by reordering signal handlers to let .NET/CoreCLR handle managed exceptions first, and then chain real native exceptions to Sentry.

Before:

           ┌───────────────┐     ┌──────────────┐     ┌────────┐
Signal────>│ Sentry Native │────>│ .NET/CoreCLR │────>│ System │
           └───────────────┘     └──────────────┘     └────────┘

After:

           ┌──────────────┐     ┌───────────────┐     ┌────────┐
Signal────>│ .NET/CoreCLR │────>│ Sentry Native │────>│ System │
           └──────────────┘     └───────────────┘     └────────┘

This approach only works with CoreCLR (UseMonoRuntime=false, experimental in Android .NET 10.0+) for the time being.

With Mono, one will have to opt in for the "chain at start" signal handler strategy until the following fix has been released:

• [mono] Restore signal handlers during crash chaining dotnet/runtime#125835

[github-actions]

Semver Impact of This PR

⚪ None (no version bump detected)

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---

Features ✨

• feat: native signal handler strategy on Android by jpnurmi in #4676

Fixes 🐛

• fix: prevent redundant native exceptions on Android/CoreCLR by jpnurmi in #5127

---

_{🤖 This preview updates automatically when you update the PR.}

[codecov]

Codecov Report

❌ Patch coverage is 75.00000% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 73.96%. Comparing base (02f59c1) to head (2a35e7a).
⚠️ Report is 34 commits behind head on feat/android-signal-handler-strategy.

Files with missing lines	Patch %	Lines
src/Sentry/Protocol/Envelopes/Envelope.cs	60.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@                           Coverage Diff                            @@
##           feat/android-signal-handler-strategy    #5127      +/-   ##
========================================================================
- Coverage                                 73.99%   73.96%   -0.03%     
========================================================================
  Files                                       499      499              
  Lines                                     18067    18067              
  Branches                                   3519     3520       +1     
========================================================================
- Hits                                      13368    13364       -4     
- Misses                                     3839     3840       +1     
- Partials                                    860      863       +3     

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