Add an injection_points isolation test suite.

Noah Misch <noah@leadboat.com>

Commit: c35f419d6efbdf1a050250d84b687e6705917711
Author: Noah Misch <noah@leadboat.com>
Date: 2024-06-28T02:21:05Z
Releases: 17.0
Add an injection_points isolation test suite.

Make the isolation harness recognize injection_points wait events as a
type of blocked state.  Test an extant inplace-update bug.

Reviewed by Robert Haas and Michael Paquier.

Discussion: https://postgr.es/m/20240512232923.aa.nmisch@google.com

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