Raise error on concurrent drop of partitioned index

Alvaro Herrera <alvherre@alvh.no-ip.org>

Commit: 15dad5776578e884ee7857abb278a116c0c3e578
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Date: 2020-09-01T17:40:43Z
Releases: 13.0
Raise error on concurrent drop of partitioned index

We were already raising an error for DROP INDEX CONCURRENTLY on a
partitioned table, albeit a different and confusing one:
  ERROR:  DROP INDEX CONCURRENTLY must be first action in transaction

Change that to throw a more comprehensible error:
  ERROR:  cannot drop partitioned index \"%s\" concurrently

Michael Paquier authored the test case for indexes on temporary
partitioned tables.

Backpatch to 11, where indexes on partitioned tables were added.

Reported-by: Jan Mussler <jan.mussler@zalando.de>
Reviewed-by: Michael Paquier <michael@paquier.xyz>
Discussion: https://postgr.es/m/16594-d2956ca909585067@postgresql.org

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