[client] Fix TURN-Relay switch

[pappz]

Describe your changes

• When a peer is connected with TURN and a Relay connection is established, do not force switching to Relay. Keep using TURN until disconnection.
• In the proxy preparation phase, the Bind Proxy does not set the remote conn as a fake address for Bind. When running the Work() function, the proper proxy instance updates the conn inside the Bind.

Note

This change breaks the [client] Fix/pkg loss #3338 PR.

Issue ticket number and link

Checklist

• Is it a bug fix
• Is a typo/documentation fix
• Is a feature enhancement
• It is a refactor
• Created tests that fail without the change (if possible)
• Extended the README / documentation, if necessary

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

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

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