Add managed attachments to native events

[TimBurik]

Package

Sentry

.NET Flavor

.NET

.NET Version

8.0.303

OS

Android

SDK Version

4.10.1

Self-Hosted Sentry Version

No response

Steps to Reproduce

1. Create an Android app and install Sentry NuGet package;
2. Configure Sentry so that reported events should have attachments (both logcat and custom attachments are affected by the issue):

SentrySdk.Init(options =>
{
    options.Dsn = "...";
    options.Android.LogCatIntegration = LogCatIntegrationType.All;
});
SentrySdk.ConfigureScope(scope =>
{
    scope.AddAttachment("path/to/existing/file.txt", AttachmentType.Default, MediaTypeNames.Text.Plain);
});

3. Generate crashes using SentrySdk.CauseCrash() with different parameters

Expected Result

All reported events should have logcat.log attachment with logcat logs and custom file.txt file attachment.

Actual Result

• Crash generated with parameter CrashType.Native is reported with mechanism signalhandler and contains no attachments;
• Crash generated with parameter CrashType.JavaBackgroundThread is reported twice: one with mechanism UncaughtExceptionHandler and contains no attachments, and another with mechanism AppDomain.UnhandledException and contains both attachments;
• All other crash types (CrashType.Managed, CrashType.ManagedBackgroundThread, CrashType.Java) are reported with mechanism AppDomain.UnhandledException and contain both attachments.

This issue might be related to #3461

Reproduction sample: SampleProject.zip