fix: panic in multi-statement queries containing RESET ALL

[levkk]

fix #1682

[codecov]

Codecov Report

❌ Patch coverage is 92.85714% with 2 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
pgdog/src/frontend/router/parser/query/set.rs	90.00%	1 Missing ⚠️
.../src/frontend/router/parser/query/test/test_set.rs	90.90%	1 Missing ⚠️

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