Some things to fix related to #18523

[majocha]

Related to #18523

WindowsNoRealsig_testDesktop does not emit test logs from failing test runs.

Some timing related tests that were quite ok now can fail in CI:

Failed FSharp.Core.UnitTests.Control.AsyncModule.AwaitWaitHandle.TimeoutWithCancellation [10 s]
Error Message:
System.Exception : Async computation was not completed in given time

and

Failed FSharp.Core.UnitTests.Control.AsyncModule.AwaitWaitHandle.DisposedWaitHandle2 [556 ms]
Error Message:
Assert.Throws() Failure: Exception type was not an exact match
Expected: typeof(System.Threading.Tasks.TaskCanceledException)
Actual: typeof(System.ObjectDisposedException)