Restore vacuum_cleanup_index_scale_factor coverage.

Peter Geoghegan <pg@bowt.ie>

Commit: ddd4cc09a6e5d775822e0244e73ca9bb894dce42
Author: Peter Geoghegan <pg@bowt.ie>
Date: 2021-03-11T20:52:35Z
Releases: 11.12
Restore vacuum_cleanup_index_scale_factor coverage.

Revert two recent commits that had btree_index.sql drop regression test
indexes rather than leave them behind for pg_dump testing.

This is intended to restore pg_upgrade coverage of indexes with the
vacuum_cleanup_index_scale_factor storage parameter set on buildfarm
member crake.

Backpatch: 11-12 only

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