chore: drop "invalid sql" test as it triggers exception breakpoints

[0ax1]

This lead to poor DX when running vortex-duckdb unit tests, as lldb stops multiple times on exception breakpoints. It is expected though and correct behavior that DuckDB throws an exception for invalid SQL queries.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.11%. Comparing base (f305580) to head (11bc693).
⚠️ Report is 1 commits behind head on develop.

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