SpotBugs review: OutboundConnectionCreator.java:[line 82] createConnection(), unused computation of ownRosterEntry

### Description

Such warnings may indicate incomplete coding or incomplete cleaning of draft idea.

```
Dead store to ownRosterEntry in com.swirlds.platform.network.connectivity.OutboundConnectionCreator.createConnection(NodeId)
--
  | Bug type DLS_DEAD_LOCAL_STORE (click for details)In class com.swirlds.platform.network.connectivity.OutboundConnectionCreatorIn method com.swirlds.platform.network.connectivity.OutboundConnectionCreator.createConnection(NodeId)Local variable named ownRosterEntryAt OutboundConnectionCreator.java:[line 82]

Dead store to ownRosterEntry in com.swirlds.platform.network.connectivity.OutboundConnectionCreator.createConnection(NodeId)
[Bug type DLS_DEAD_LOCAL_STORE (click for details)](https://github.com/hashgraph/hedera-services/issues/new?assignees=&labels=bug&projects=&template=bug.yml#DLS_DEAD_LOCAL_STORE)
In class com.swirlds.platform.network.connectivity.OutboundConnectionCreator
In method com.swirlds.platform.network.connectivity.OutboundConnectionCreator.createConnection(NodeId)
Local variable named ownRosterEntry
At OutboundConnectionCreator.java:[line 82]
```

82 `final RosterEntry ownRosterEntry = RosterUtils.getRosterEntry(roster, selfId.id());`
the variable ownRosterEntry is never used

### Steps to reproduce

To run SpotBugs

### Additional context

_No response_

### Hedera network

_No response_

### Version

v0.58

### Operating system

Linux

Inspect OutboundConnectionCreator.java at line 82 and the createConnection(NodeId) method, focusing on the reported ownRosterEntry computation. Run SpotBugs as described in the issue and confirm the DLS_DEAD_LOCAL_STORE warning is no longer reported for this method.

Written by the indexing model from the issue text.