ci: freebsd: stop postgres instance on failure, to prevent log upload failures

Try to fix pg_upgrade test on Windows, again.

Refactor rmtree() to use get_dirent_type().

Fix unlink() for STATUS_DELETE_PENDING on Windows.

Fix precision handling for some COERCE_SQL_SYNTAX functions

Replace SQLValueFunction by COERCE_SQL_SYNTAX

Switch SQLValueFunction on "name" to use COERCE_SQL_SYNTAX

Improve coverage of ruleutils.c for SQLValueFunctions