ext/pgsql: Refactor tests (#12608)

This makes the tests independent of each other and allows them to be run in parallel.

Co-authored-by: Gina Peter Banyard <girgias@php.net>

ext/pgsql: fix PGtrace invalid free issue.

disable trace when closing the connection, is a no op if there is no stream
attached to it.

Close GH-11403

ext/pgsql: fix pg_trace test when trace mode is supported. (#11191)

ext/pgsql: pg_trace allow to refine its trace mode via 2 new constants.

- PGSQL_TRACE_SUPPRESS_TIMESTAMPS.
- PGSQL_TRACE_REGRESS_MODE to have a more verbose and observable
output to

ext/pgsql: pg_trace allow to refine its trace mode via 2 new constants.

- PGSQL_TRACE_SUPPRESS_TIMESTAMPS.
- PGSQL_TRACE_REGRESS_MODE to have a more verbose and observable
output to check possible regressions.

Close GH-11041

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