Remove DiffSuppressFunc from cluster membership type

Author: anthonyrtong

mmv1/third_party/terraform/services/container/resource_container_cluster.go.tmpl

@@ -2455,7 +2455,6 @@ func ResourceContainerCluster() *schema.Resource {
 							Optional:     true,
 							ValidateFunc: validation.StringInSlice([]string{"LIGHTWEIGHT"}, false),
 							Description:  `The type of the cluster's fleet membership.`,
-							DiffSuppressFunc: tpgresource.EmptyOrDefaultStringSuppress("MEMBERSHIP_TYPE_UNSPECIFIED"),
 						},
 					},
 				},