If you stop the debug session when stopped at a breakpoint the test session does not end

[karthiknadig]

Testing #21306

Repro:

1. Set a breakpoint in a test.
2. Start a debug session.
3. Press the stop button for the debug session

Actual: test spinner continues to spin
Expected: test should stop running.

[eleanorjboyd]

Note: Also occurs for pytest in addition to unittest