Remove pgstat_flush_wal()

Remove pgstat_flush_wal()

All the processes that generate WAL should call pgstat_report_wal() to
report all their statistics related to WAL, and this is already what
happens in the tree.  Keeping pgstat_report_wal() is confusing while the
other routine is encouraged.

This routine is not required since fc415edf8ca8, where it was lastly
used in pgstat_report_stat() before an equivalent callback existed.

Author: Bertrand Drouvot <bertranddrouvot.pg@gmail.com>
Discussion: https://postgr.es/m/Z71oPkJJICrRB5Ws@paquier.xyz