Freeze the s3 APIs until the notification sub-system initializes completely (#17182)

cmd/common-main.go

@@ -776,6 +776,8 @@ func handleCommonEnvVars() {
 	} else {
 		globalActiveCred = auth.DefaultCredentials
 	}
+
+	globalDisableFreezeOnBoot = env.Get("_MINIO_DISABLE_API_FREEZE_ON_BOOT", "") == "true" || serverDebugLog
 }
 
 // Initialize KMS global variable after valiadating and loading the configuration.