Filter out ExcludePaths from PR files before processing (Azure#39672)

Author: JimSuplizio

eng/scripts/Language-Settings.ps1

@@ -48,6 +48,12 @@ function Get-python-AdditionalValidationPackagesFromPackageSet {
     $targetedFiles += $diff.DeletedFiles
   }
 
+  # The targetedFiles needs to filter out anything in the ExcludePaths
+  # otherwise it'll end up processing things below that it shouldn't be.
+  foreach ($excludePath in $diffObj.ExcludePaths) {
+    $targetedFiles = $targetedFiles | Where-Object { -not $_.StartsWith($excludePath) }
+  }
+
   if ($targetedFiles) {
     foreach($file in $targetedFiles) {
       $pathComponents = $file -split "/"