fix: avoid double schema projection in file format readers

[WenyXu]

I hereby agree to the terms of the GreptimeDB CLA.

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What's changed and what's your intention?

This PR fixes a schema projection issue in the file format readers (CSV and JSON) used by the Copy From statement. The readers were incorrectly applying schema projection twice, which could lead to schema mismatch errors.

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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[v0y4g3r]

LGTM