Delete TURNConfig section from script

[braginini]

Removed TURN configuration from the getting-started.

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• Is it a bug fix
• Is a typo/documentation fix
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[Copilot]

Pull Request Overview

This PR removes the TURN configuration section from the getting-started-with-zitadel.sh script, simplifying the network configuration by eliminating TURN server settings.

• Removed the TURNConfig section from the management JSON configuration
• Eliminated TURN server credentials and protocol settings
• Streamlined the network configuration to focus on STUN and Relay configurations

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[sonarqubecloud]

Quality Gate failed

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62 New issues
62 New Code Smells (required ≤ 0)

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