Mark unsafe_tests module as not runnable with installcheck

Andrew Dunstan <andrew@dunslane.net>

Commit: 872e3d150e9aad110cfbd80c38b15e2219eacf45
Author: Andrew Dunstan <andrew@dunslane.net>
Date: 2023-03-12T13:00:32Z
Releases: 16.0
Mark unsafe_tests module as not runnable with installcheck

This was an omission in the original creation of the module.

Also slightly adjust some wording to avoid a double "is".

Backpatch the non-meson piece of this to release 12, where the module
was introduced.

Discussion: https://postgr.es/m/be869e1c-8e3f-4cde-8609-212c899cccf9@dunslane.net

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