PostgreSQL: Improve SQL error handling
After a query error, PostgreSQL transaction is aborted
until it's terminated or the query is closed.
All further queries result in:
ERROR: current transaction is aborted, commands ignored until end of transaction block
Those subsequent errors are ignored by double fault handling in
DatabaseBase::reportQueryError but they cause all localization
of error messages to fail (unable to issue queries to message
tables) and errors lke
This resulted in a broken MediaWiki screen with
instead of localized error message.
We need to fully reset database connection because after
pg_connection_reset() various session parameters need to
be set again (like "search_path"), otherwise tables will not be
ERROR: relation "msg_resource" does not exist ERROR: relation "l10n_cache" does not exist