amcheck: Test gin_index_check on a multicolumn index

Adds a regression test with gin_index_check() on a multicolumn index,
to verify it's handled correctly and improve test coverage for code
introduced by 14ffaece0fb5.

Author: Arseniy Mukhin <arseniy.mukhin....@gmail.com>
Reviewed-by: Andrey M. Borodin <x4...@yandex-team.ru>
Discussion: 
https://postgr.es/m/CAE7r3MJ611B9TE=yqbbncewp7-k64vws+sjk7xf6fjux77u...@mail.gmail.com

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/c89d6b889ce958dcab27b0342eca36634c0fefaf

Modified Files
--------------
contrib/amcheck/expected/check_gin.out | 12 ++++++++++++
contrib/amcheck/sql/check_gin.sql      | 10 ++++++++++
2 files changed, 22 insertions(+)

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