refactor: remove unused symbols

[waynexia]

I hereby agree to the terms of the GreptimeDB CLA.

Refer to a related PR or issue link (optional)

What's changed and what's your intention?

Always find something reporting compile errors but is used nowhere...

Checklist

• I have written the necessary rustdoc comments.
• I have added the necessary unit tests and integration tests.
• This PR requires documentation updates.

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Copilot reviewed 20 out of 20 changed files in this pull request and generated no comments.

[v0y4g3r]

LGTM