fix: port placement when path based routing is used

[boriscosic]

Description

As per #10641, when path routing is used without port, port is appended to serverAddress resulting in incorrect endpoint.

Testing done

Describe the testing strategy. Unit and integration tests are expected for any behavior changes.

Reviewer checklist

• Ensure docs are updated if necessary. (eg. if a user visible feature is being added or changed).
• Ensure relevant issues are linked (description should include text like "Fixes #")
• Do these changes have compatibility implications for rollback? If so, ensure that the ksql command version is bumped.

[confluent-cla-assistant]

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✅ boriscosic
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