Test that VM clear registers VM buffers

The WAL summarizer only tracks registered buffers, so unregistered VM
clears are ommitted from incremental backups, corrupting the restored
visibility map. Test those cases are now fixed.

Author: Melanie Plageman <[email protected]>
Reviewed-by: Andrey Borodin <[email protected]>
Discussion: 
https://postgr.es/m/oqcsevg35xjan2327x5kdfth6q4fgeqboxfo3v3imeyih2uiny%406sez5dzxl6nt
Backpatch-through: 17

Branch
------
REL_19_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/9171f77db2326c65fc69ab81d156622d19163b6a

Modified Files
--------------
src/bin/pg_combinebackup/Makefile                |   2 +
src/bin/pg_combinebackup/meson.build             |   1 +
src/bin/pg_combinebackup/t/012_vm_consistency.pl | 258 +++++++++++++++++++++++
3 files changed, 261 insertions(+)

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