fix: update Core public API snapshots for all frameworks

[thomhurst]

Summary

• Merged PRs chore: centralize hardcoded configuration values into constants #4929 and feat: retry policies with exponential backoff and exception filtering #4949 added new public API surface to TUnit.Core but the snapshot files were not updated
• This causes Core_Library_Has_No_API_Changes test failures in all PR CI pipelines (modularpipeline ubuntu/macos/windows jobs)
• Updates DotNet8_0, DotNet9_0, and DotNet10_0 verified snapshot files

Test plan

• dotnet test --project TUnit.PublicAPI --framework net8.0 passes
• dotnet test --project TUnit.PublicAPI --framework net9.0 passes
• dotnet test --project TUnit.PublicAPI --framework net10.0 passes

[claude]

Code Review

Issue found: Tests.Core_Library_Has_No_API_Changes.Net4_7.verified.txt not updated

This PR fixes the snapshot test failures for DotNet8_0, DotNet9_0, and DotNet10_0, but the Net4_7 verified snapshot was not updated — meaning the Windows CI pipeline will still fail for this test.

Why it matters:

RunPublicAPITestsModule extends TestBaseModule without overriding TestableFrameworks. The base implementation yields "net472" on Windows:

// TUnit.Pipeline/Modules/Abstract/TestBaseModule.cs:22
if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
{
    yield return "net472";
}

Since ExecuteAsync iterates over all TestableFrameworks, the public API test runs against the net472 target on Windows CI.

The Net4_7.verified.txt snapshot is currently missing all new API members:

Checked against the source files — none of the new code has #if conditional compilation guards, so these APIs are compiled into the netstandard2.0 target (used by net472) as well. The following are absent from Tests.Core_Library_Has_No_API_Changes.Net4_7.verified.txt:

• New public static class Defaults with ForcefulExitTimeout, HookTimeout, ProcessExitHookDelay, TestTimeout
• public void SetRetryBackoff(int backoffMs, double backoffMultiplier) on DiscoveredTestContext
• public int BackoffMs { get; set; }, public double BackoffMultiplier { get; set; }, public Type[]? RetryOnExceptionTypes { get; set; } on RetryAttribute
• public int RetryBackoffMs { get; set; }, public double RetryBackoffMultiplier { get; set; } on TestDetails
• int RetryBackoffMs { get; }, double RetryBackoffMultiplier { get; } on ITestConfiguration

Fix: Run the public API tests on net472 locally (Windows only) and accept the .received.txt output as the new .verified.txt, or manually mirror the same additions made to the other three snapshot files into Tests.Core_Library_Has_No_API_Changes.Net4_7.verified.txt.