DefaultReplicationAgents rule doesn't normalize replication target URIs

at [0], `DefaultReplicationAgents` configures the replication agents with supplied `serverUrl + /bin/receive` as transport URI.
However, since the `serverUrl` may have a trailing character, [0] should normalize the replication target URI before updating the replication agent config to avoid double slashes in the target URI.

[0] https://github.com/adobe/aem-testing-clients/blob/cq-65/src/main/java/com/adobe/cq/testing/junit/rules/DefaultReplicationAgents.java#L103