[CRE][Gateway] Support multi-DON config in ConnectionManager

[bolekk]

This migrates the "response path" (node messages) to the multi-DON setting.

[github-actions]

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[github-actions]

✅ No conflicts with other open PRs targeting develop

[trunk-io]

     

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[cl-sonarqube-production]

Quality Gate passed

Issues
0 New issues
0 Fixed issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

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[Tofel]

@bolekk one question: is there a reason for enabling multi-DON support as a special case for Sharded DONs instead of doing that for any and all DONs?

[bolekk]

@Tofel Current config format doesn't support one handler attached to multiple DONs. I will migrate everything to the new ShardedDon format, it's just more generic. DONs that are not sharded will have a single shard. The old config will be deprecated.