tests: Try the GitHub Windows runner

Author: euanh

.github/workflows/pull_request.yml

@@ -23,6 +23,8 @@ jobs:
             linux_6_0_arguments_override: "--skip SmokeTests"
             linux_nightly_6_0_arguments_override: "--skip SmokeTests"
             linux_nightly_main_arguments_override: "--skip SmokeTests"
+            windows_6_0_enabled: true
+            windows_6_0_arguments_override: "--skip SmokeTests"
 
     integration-tests:
         name: Integration tests