Add subxid-overflow "isolation" test

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

Commit: 0e733278e346f19df93843bce9a81c8183df6e1d
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Date: 2022-09-14T14:10:01Z
Releases: 16.0
Add subxid-overflow "isolation" test

This test covers a few lines of subxid-overflow-handling code in various
part of the backend, which are otherwise uncovered.

Author: Simon Riggs <simon.riggs@enterprisedb.com>
Reviewed-by: Dilip Kumar <dilipbalaut@gmail.com>
Discussion: https://postgr.es/m/CANbhV-H8ov5+nCMBYQFKhO+UZJjrFgY_ORiMWr3RhS4+x44PzA@mail.gmail.com

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