Release lock on heap buffer before vacuuming FSM

When there are no indexes on a table, we vacuum each heap block after
pruning it and then update the freespace map. Periodically, we also
vacuum the freespace map. This was done while unnecessarily holding a
lock on the heap page. Release the lock before calling
FreeSpaceMapVacuumRange() and, while we're at it, ensure the range
includes the heap block we just vacuumed.

There are no known deadlocks or other similar issues, therefore don't
backpatch. It's certainly not good to do all this work under a lock, but it's
not frequently reached, making it not worth the risk of backpatching.

Author: Melanie Plageman <melanieplageman@gmail.com>
Reviewed-by: Andres Freund <andres@anarazel.de>
Discussion: https://postgr.es/m/CAAKRu_YiL%3D44GvGnt1dpYouDSSoV7wzxVoXs8m3p311rp-TVQQ%40mail.gmail.com

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