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]

Codecov Report

✅ All modified and coverable lines are covered by tests.
⚠️ Please upload report for BASE (version6@a739982). Learn more about missing BASE report.

Additional details and impacted files

@@             Coverage Diff             @@
##             version6    #4671   +/-   ##
===========================================
  Coverage            ?   73.17%           
===========================================
  Files               ?      480           
  Lines               ?    17421           
  Branches            ?     3437           
===========================================
  Hits                ?    12748           
  Misses              ?     3822           
  Partials            ?      851           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.