Disable debug_discard_caches in test_oat_hooks test.

Tom Lane <tgl@sss.pgh.pa.us>

Commit: 3efc82e28951c6eee24aead056b8478cb424af2e
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2022-11-19T18:42:53Z
Releases: 16.0
Disable debug_discard_caches in test_oat_hooks test.

The test output varies when debug_discard_caches is enabled,
because that causes extra executions of recomputeNamespacePath.
Maybe putting a hook in that was a bad idea, but as a stopgap,
just turn off debug_discard_caches in this test.

Per buildfarm (now that we have debug_discard_caches coverage
again).  Back-patch to v15 where this module was added.

Discussion: https://postgr.es/m/2267406.1668804934@sss.pgh.pa.us

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