chore: remove unused code from server

[tac0turtle]

Description

Move FreeTCPAddr to testutil/network since it's mainly used there. This mainly reduces amount of files in server package.

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• included the necessary unit and integration tests
• added a changelog entry to CHANGELOG.md
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• confirmed the correct type prefix in the PR title
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• reviewed state machine logic
• reviewed API design and naming
• reviewed documentation is accurate
• reviewed tests and test coverage
• manually tested (if applicable)

[julienrbrt]

lgtm

[sonarqubecloud]

[Cosmos SDK] Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
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0.0% Duplication