Improve Jira logging for NodeAutoShutdownIfOfflineService

Problem Definition

As part of the fix in JRASERVER-42916 we have new NodeAutoShutdownIfOfflineService
It's responsible for killing and shutting down Jira node. As part of Online check, a node can be automatically flagged as OFFLINE node, so Jira needs to prevent cluster caches corruption. If a node is in the OFFLINE state, other nodes in the cluster stop cache replication. Due to this fact, a node will be scanning its own state.

(i)If it will detect that was marked as OFFLINE, this Jira node will exit in panic mode. Example logging:

2021-02-10 11:28:38,632+0000 heartbeat-scheduler-0 ERROR      [c.a.j.cluster.service.NodeAutoShutdownIfOfflineService] [CLUSTER-STATE] This node NODE2 was moved to OFFLINE by another node. This node needs to be shut down as soon as possible.
2021-02-10 11:28:38,632+0000 heartbeat-scheduler-0 ERROR      [c.a.jira.startup.JiraShutdown] This Jira instance was requested to exit in panic mode
java.lang.Exception
	at com.atlassian.jira.startup.JiraShutdown.panic(JiraShutdown.java:19)
	at com.atlassian.jira.cluster.service.NodeAutoShutdownIfOfflineService.checkCurrentNodeState(NodeAutoShutdownIfOfflineService.java:78)
	at com.atlassian.jira.cluster.lock.ClusterHeartbeatJob.run(ClusterHeartbeatJob.java:36)
	at 

Sometimes it's not clear why marked the node offline and what's the current status of the Cluster Hearbeat for the current node.

Suggested Solution

Add debug logging into NodeAutoShutdownIfOfflineService.class which will show details about stale node state.

Workaround

Run queries manually

SELECT * FROM clusternodeheartbeat;
SELECT NODE_ID FROM clusternodeheartbeat WHERE (HEARTBEAT_TIME >  '<NOW - 2 DAYS>' )