[CI] Add PS script to detect hung tests on Windows (#16863)

This is just the existing code we have in the run-tests yaml moved to a
script.

In a subsequent PR I'm going to expand these checks to fix recent hangs
we've seen, and I can't use an action because that requires a checkout
which will fail if there's a hung test, so we need a normal script.

Signed-off-by: Sarnie, Nick <[email protected]>

devops/scripts/windows_detect_hung_tests.ps1

@@ -0,0 +1,8 @@
+$exitCode = 0
+$hungTests = Get-Process | Where-Object { ($_.Path -match "llvm\\install") -or ($_.Path -match "llvm\\build-e2e") }
+$hungTests | Foreach-Object {
+ $exitCode = 1
+ echo "Test $($_.Path) hung!"
+ Stop-Process -Force $_
+}
+exit $exitCode