Rewrite warning related tests

[BuonOmo]

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These tests are based on PL-PGSQL usage, triggering warnings. They do not working with the CRDB compatible PL-PGSQL. We need to rewrite them.

• [ ] test_ignores_warnings_when_behaviour_ignore
• [ ] test_logs_warnings_when_behaviour_log
• [ ] test_raises_warnings_when_behaviour_raise
• [ ] test_reports_when_behaviour_report
• [ ] test_warnings_behaviour_can_be_customized_with_a_proc
• [ ] test_allowlist_of_warnings_to_ignore
• [ ] test_allowlist_of_warning_codes_to_ignore

This is the failing PL-PGSQL:

do $$ BEGIN RAISE WARNING 'PostgreSQL SQL warning'; END; $$