reset session identity during pool cleanup

[murex971]

RESET ALL does not reset role or session_authorization.
Run SET SESSION AUTHORIZATION DEFAULT before the existing dirty cleanup. This
restores the authenticated user and clears any active role, covering both
SET ROLE and SET SESSION AUTHORIZATION.

closes: #1341

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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[levkk]

I think to resolve the original issue you want to make sure we detect the role change automatically and reset it back. This test artificially creates that condition.

I think we need to adjust the query parser set handler to detect SET ROLE and mark the server as dirty for cleanup.