GD-44: Cancel not propagated on C# Dev Kit Test Explorer

[MikeSchulze]

The used GdUnit4 version:
GdUnit4Mono 4.2.1

The used Godot version:
Godot 4.2.1

OS including version:
Windows 11

Describe the bug
Using the gdunit4.test.adapter in Visual Studio Code and C# Dev Kit.
When running the tests from the "Test Explorer" the cancel do not kill the child Godot process.

microsoft/vscode-dotnettools#947

Steps to Reproduce

• Open the TEST EXPLORER
• Select GdUnit4.Tests.Asserts and press run
• Wait until tests ar started and press the cancel button on the test explorer
  The test looks like are canceld
  

========== Starting test run ==========
Start executing tests, 131 TestCases total.
Run tests -------->
stdout: Godot Engine v4.2.1.stable.mono.official.b09f793f5 - https://godotengine.org
stdout: Vulkan API 1.3.260 - Forward+ - Using Vulkan Device #0: NVIDIA - NVIDIA GeForce RTX 4070 Ti
stdout: Load testsuite D:\development\workspace\gdUnit4Mono\test\src\asserts\AssertionsTest.cs
stdout: Load testsuite D:\development\workspace\gdUnit4Mono\test\src\asserts\BoolAssertTest.cs
stdout: Load testsuite D:\development\workspace\gdUnit4Mono\test\src\asserts\DictionaryAssertTest.cs
stdout: Load testsuite D:\development\workspace\gdUnit4Mono\test\src\asserts\EnumerableAssertTest.cs
stdout: Load testsuite D:\development\workspace\gdUnit4Mono\test\src\asserts\NumberAssertTest.cs
stdout: Load testsuite D:\development\workspace\gdUnit4Mono\test\src\asserts\ObjectAssertTest.cs
stdout: Load testsuite D:\development\workspace\gdUnit4Mono\test\src\asserts\SignalAssertTest.cs
stdout: Load testsuite D:\development\workspace\gdUnit4Mono\test\src\asserts\StringAssertTest.cs
stdout: Load testsuite D:\development\workspace\gdUnit4Mono\test\src\asserts\Vector2AssertTest.cs
========== Test run aborted: 19 Tests (19 Passed, 0 Failed, 0 Skipped) run in < 1 ms ==========

But the Godot test runner process is still running until all tests are finished.