Add back vacuum_cleanup_index_scale_factor parameter.

Peter Geoghegan <pg@bowt.ie>

Commit: effdd3f3b633e88feaa675377075f02ecc99aee4
Author: Peter Geoghegan <pg@bowt.ie>
Date: 2021-03-11T20:42:46Z
Releases: 14.0
Add back vacuum_cleanup_index_scale_factor parameter.

Commit 9f3665fb removed the vacuum_cleanup_index_scale_factor storage
parameter.  However, that creates dump/reload hazards when moving across
major versions.

Add back the vacuum_cleanup_index_scale_factor parameter (though not the
GUC of the same name) purely to avoid problems when using tools like
pg_upgrade.  The parameter remains disabled and undocumented.

No backpatch to Postgres 13, since vacuum_cleanup_index_scale_factor was
only disabled by REL_13_STABLE's version of master branch commit
9f3665fb in the first place -- the parameter already looks like this on
REL_13_STABLE.

Discussion: https://postgr.es/m/YEm/a3Ko3nKnBuVq@paquier.xyz

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Cited messages not in the archive: YEm/a3Ko3nKnBuVq@paquier.xyz