CAMEL-7286 polish the code of SnsEndpoint
CAMEL-7286 fixed the same issue of other aws clients

Conflicts:
	components/camel-aws/src/main/java/org/apache/camel/component/aws/s3/S3Endpoint.java

Conflicts:
	components/camel-aws/src/main/java/org/apache/camel/component/aws/sqs/SqsEndpoint.java