fix: deliver system breadcrumbs in the main thread on Android

[jpnurmi]

Fixes: #3828

• NETWORK_CAPABILITIES_CHANGED and BATTERY_CHANGED events on Android (with Maui) causing SIGSEGV Segfault #3828

Deliver network and system event (battery) breadcrumbs in the main thread on Android, to avoid calling the C# beforeBreadcrumb callback from unmanaged internal Android worker threads, which can result in obscure and hard to debug crashes (#3828 (comment)).

Manually tested with Sentry.Samples.Maui and the following beforeBreadcrumb callback in MauiProgram.cs:

options.SetBeforeBreadcrumb((crumb, hint) =>
{
    var threadId = Thread.CurrentThread.ManagedThreadId;
    var threadName = Thread.CurrentThread.Name ?? (MainThread.IsMainThread ? "MAIN" : "WORKER");
    var crumbData = crumb.Data != null ? string.Join(", ", crumb.Data.Select(kv => $"{kv.Key}={kv.Value}")) : "null";
    Console.WriteLine($"[{threadName}:{threadId}] BeforeBreadcrumb Message={crumb.Message ?? "null"}, Level={crumb.Level}, Type={crumb.Type}, Category={crumb.Category}, Data={{{crumbData}}}");
    return crumb;
});

Before

11-03 11:06:55.598 10782 10806 I DOTNET  : [WORKER:6] BeforeBreadcrumb Message=null, Level=Info, Type=system, Category=network.event, Data={upload_bandwidth=12000, action=NETWORK_CAPABILITIES_CHANGED, vpn_active=false, signal_strength=-50, network_type=wifi, download_bandwidth=30000}
11-03 11:07:09.464 10782 10810 I DOTNET  : [WORKER:8] BeforeBreadcrumb Message=null, Level=Info, Type=system, Category=device.event, Data={level=50, charging=false, action=BATTERY_CHANGED}

After

11-03 11:09:05.534 11756 11756 I DOTNET  : [MAIN:1] BeforeBreadcrumb Message=null, Level=Info, Type=system, Category=network.event, Data={upload_bandwidth=12000, action=NETWORK_CAPABILITIES_CHANGED, vpn_active=false, signal_strength=-50, network_type=wifi, download_bandwidth=30000}
11-03 11:09:59.002 11756 11756 I DOTNET  : [MAIN:1] BeforeBreadcrumb Message=null, Level=Info, Type=system, Category=device.event, Data={level=1, charging=false, action=BATTERY_CHANGED}

Depends on:

• chore(deps): update Java SDK to v8.24.0 #4667
• Merge remote-tracking branch 'upstream/main' into version6 #4683

[codecov]

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Additional details and impacted files

@@             Coverage Diff             @@
##             version6    #4671   +/-   ##
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[jamescrosswell]

Awesome... the cumulation of a lot of sleuthing. Thanks @jpnurmi !

I guess there's no easy way to test this eh? Would need an integration test presumably. If that's not too painful, we could add one... but fine to merge as is otherwise.

[jpnurmi]

The integration test seems finally ok. It took a few rounds to make it pass with all tested configurations.

[jamescrosswell]

The integration test seems finally ok. It took a few rounds to make it pass with all tested configurations.

Sorry for making you go to that effort... hopefully the tests catch some bugs in the future!