Removed cloud identity group membership set_computed_name post_create (GoogleCloudPlatform#13628)

Author: melinath

mmv1/products/cloudidentity/GroupMembership.yaml

@@ -37,7 +37,6 @@ timeouts:
   update_minutes: 20
   delete_minutes: 20
 custom_code:
-  post_create: 'templates/terraform/post_create/set_computed_name.tmpl'
   custom_update: 'templates/terraform/custom_update/cloud_identity_group_membership.go.tmpl'
   post_import: 'templates/terraform/post_import/cloud_identity_group_membership.go.tmpl'
 exclude_sweeper: true