Fix backup/restore for the embedded server

[parkerduckworth]

This PR addresses improper internal port configuration at embedded DB startup. We received a user report (weaviate/weaviate#6570) that backups created with the embedded DB always fail.

I was able to reproduce this for all versions >= 1.25.0, indicating that this issue was somehow related to Raft (which was introduced in 1.25.0)

The wrongly-configured internal cluster communication ports resulted in the raft port for the node being set to the same port as the gossip protocol data_bind_port (which is used to transmit data from node to node). This caused all intra cluster comms to fail. We never noticed this before because the embedded DB does not support multi-node mode. However, backups are an edge case here, because all backups are treated as if they were distributed, so all backup comms require making requests to the intra cluster server.

So now this is fixed, and if we ever decide to support clustering for embedded DB, we are one step closer :)

[orca-security-eu]

Orca Security Scan Summary

Status	Check	Issues by priority
Passed	Infrastructure as Code	0   0   0   0	View in Orca
Passed	Secrets	0   0   0   0	View in Orca
Passed	Vulnerabilities	0   0   0   0	View in Orca

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.03%. Comparing base (dee9f6b) to head (9d4f948).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1485      +/-   ##
==========================================
+ Coverage   89.94%   90.03%   +0.08%     
==========================================
  Files         174      174              
  Lines       14919    14940      +21     
==========================================
+ Hits        13419    13451      +32     
+ Misses       1500     1489      -11     

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[weaviate-git-bot]

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