win_dsc - return warning from DSC invocation (#51927)

test/integration/targets/win_dsc/tasks/tests.yml

@@ -307,6 +307,9 @@
     that:
     - test_dsc_custom is changed
     - test_dsc_custom_output.content|b64decode|strip_newline == test_dsc_custom_expected|strip_newline
+    - test_dsc_custom.warnings | length == 2
+    - "'[[xTestResource]DirectResourceAccess] test warning' in test_dsc_custom.warnings[0]"
+    - "'[[xTestResource]DirectResourceAccess] set warning' in test_dsc_custom.warnings[1]"
 
 - name: run custom DSC resource with version
   win_dsc:

test/integration/targets/win_dsc/templates/ANSIBLE_xTestResource.psm1

@@ -119,6 +119,7 @@ CimInstanceArrayParam:
     }
     New-Item -Path $Path -ItemType File > $null
     Set-Content -Path $Path -Value $file_contents > $null
+    Write-Warning -Message "set warning"
 }
 
 Function Test-TargetResource
@@ -167,6 +168,7 @@ Function Test-TargetResource
         [Microsoft.Management.Infrastructure.CimInstance[]]
         $CimInstanceArrayParam
     )
+    Write-Warning -Message "test warning"
     return $false
 }