[TRACKING ISSUE] Continue trying if initial membership event retrieval fails and client is failover [API-2171] #861
Description
The tracking issue for the Java side PR.
See hazelcast/hazelcast#26009 for details.
As reported in https://hazelcast.atlassian.net/browse/API-2171, the client was not continuing trying next clusters if the connected cluster fails to send initial membership event in time. I added a check about client being failover in the conn. manager and conditionally handle the case.
This PR also adds required internal getters/APIs used in the test FailoverClusterMembershipEventTest in the EE PR https://github.com/hazelcast/hazelcast-enterprise/pull/6874