Fix: Connection factory should ensure listeners' managedConnectionPostClose() method are invoked when closing managed connection

[LennonChin]

When the ConnectionFactory fails to close the underlying JDBC connection, the thrown exception prevents the listeners' managedConnectionPostClose method from being called. ManagedConnection relies on the managedConnectionPostClose method to remove itself from the ConnectionManager's ConnectionsCache.

Failure to close the underlying JDBC connection may indicate that the underlying connection is corrupted (e.g., disconnected, lost, etc.). Failure to remove ManagedConnection from the ConnectionManager's ConnectionsCache will result in ManagedConnection holding corrupted JDBC connections remaining in the cache, leading to their reuse and subsequent errors.