fix: skip replacing exprs of the DistinctOn node

[evenyag]

I hereby agree to the terms of the GreptimeDB CLA.

Refer to a related PR or issue link (optional)

#5799

What's changed and what's your intention?

Quick fix for the panic that DistinctOn::with_new_exprs() can't receive sort_expr.

This PR skips replacing exprs of the DistinctOn node.

PR Checklist

Please convert it to a draft if some of the following conditions are not met.

• I have written the necessary rustdoc comments.
• I have added the necessary unit tests and integration tests.
• This PR requires documentation updates.
• API changes are backward compatible.
• Schema or data changes are backward compatible.

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[killme2008]

LGTM