Add Support for custom connection provider for replica discovery

[wyrzyk]

…AuroraMultiReplicaConsistency`

[bilalshehata]

LGTM

[wyrzyk]

We are discovering replicas during isConsistent check. Previously we used a replica connection as a consistency check method parameter. Later, the same connection was reused for the consistency check and hopefully for the user query. This connection was part of the DB replica connection lifecycle and the connection was eventually closed when no longer needed.
Yesterday I introduced changes where we inject the connection provider outside of the lifecycle, but I forgot that it now needs to be closed manually. The fix ensures that the connection is closed, while leaving the old path (detecting replicas with a replica connection) unchanged.