Clean test_rls_hooks module

Andrew Dunstan <andrew@dunslane.net>

Commit: c97e4bdcb142effc452d33b81f31e0b3ac990b71
Author: Andrew Dunstan <andrew@dunslane.net>
Date: 2022-03-23T19:11:45Z
Releases: 15.0
Clean test_rls_hooks module

This module isn't an extension and doesn't need to be preloaded.
Adjust the Makefile and remove the extraneous .control and .conf
files accordingly.

Discussion: https://postgr.es/m/43bcaaab-077e-cebe-35be-3cd7f2633449@dunslane.net

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