Remove nonmeaningful prefixes in PgStat_* fields

When Who What
2023-03-23 23:52:38 Michael Paquier (michael-kun) Closed in commitfest 2023-03 with status: Committed
2023-03-23 23:52:38 Michael Paquier (michael-kun) Changed committer to michael-kun
2023-03-20 07:34:05 Michael Paquier (michael-kun) New status: Waiting on Author
2023-01-12 09:51:06 Bertrand Drouvot (bertranddrouvot.pg) Changed authors to Bertrand Drouvot (bertranddrouvot.pg)
2023-01-12 09:51:06 Bertrand Drouvot (bertranddrouvot.pg) Changed targetversion to 16
2023-01-12 09:50:48 Bertrand Drouvot (bertranddrouvot.pg) Attached mail thread 9142f62a-a422-145c-bde0-b5bc498a4ada@gmail.com
2023-01-12 09:50:48 Bertrand Drouvot (bertranddrouvot.pg) Created patch record