update error message for instanceAlreadyExists (#4979) (#9591)

Signed-off-by: Modular Magician <magic-modules@google.com>

Author: modular-magician

.changelog/4979.txt

@@ -0,0 +1,3 @@
+```release-note:bug
+sql: fixed bug where the provider would retry on an error if the database instance name couldn't be reused.
+```

google/error_retry_predicates.go

@@ -182,7 +182,7 @@ func isSqlInternalError(err error) (bool, string) {
 // concurrent operations.
 func isSqlOperationInProgressError(err error) (bool, string) {
 	if gerr, ok := err.(*googleapi.Error); ok && gerr.Code == 409 {
-		if strings.Contains(gerr.Body, "you cannot reuse the name of the deleted instance until one week from the deletion date.") {
+		if strings.Contains(gerr.Body, "instanceAlreadyExists") {
 			return false, ""
 		}