injection_points: Add basic isolation test

Michael Paquier <michael@paquier.xyz>

Commit: a7800cf498a36456bf4bd7a52e3b81cc225c5a65
Author: Michael Paquier <michael@paquier.xyz>
Date: 2024-10-21T02:10:51Z
Releases: 18.0
injection_points: Add basic isolation test

This test can act as a template when implementing an isolation test with
injection points, and tracks in a much simpler way some of the behaviors
implied in the existing isolation test "inplace" that has been added in
c35f419d6efb.  Particularly, a detach does not affect a backend wait; a
wait needs to be interrupted by a wakeup.

Reviewed-by: Bertrand Drouvot
Discussion: https://postgr.es/m/ZxGTONm_ctQz--io@paquier.xyz

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