Fix sdk generation

Author: andrueastman

.azure-pipelines/generation-templates/capture-metadata.yml

@@ -120,7 +120,7 @@ steps:
   displayName: 'verify whether metadata is parsable as an Edm model'
 
 # clean up extra files
-- pwsh: rm $(Build.SourcesDirectory)/msgraph-metadata/transformed_*_metadata.* -Verbose -Force
+- pwsh: rm "$(Build.SourcesDirectory)/msgraph-metadata/transformed_*_metadata.*" -Verbose -Force
   displayName: 'clean up transformed metadata generated by validation'
 
 # Checkin clean metadata into metadata repo or make it an artifact.