The new option removes the pg_catalog schema before function calls.
These may occur when PG replaces the desired function with an
adequate other function.

Unfortunately position('a', 'b') is not directly callable.
The reason is the parameters flipped compared to
position('b' in 'a').

Possible is
position('b' in 'a')
pg_catalog.position('a', 'b')
strpos('a', 'b')
pg_catalog.strpos('a', 'b')

Rename option to remove-pg_catalog-from-functions and move it closer to other named options

No functional change