Rename debug_invalidate_system_caches_always to debug_discard_caches.

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

Commit: d68a00391214be2020e49be4b55f761d47a5c229
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2021-07-13T19:01:01Z
Releases: 15.0
Rename debug_invalidate_system_caches_always to debug_discard_caches.

The name introduced by commit 4656e3d66 was agreed to be unreasonably
long.  To match this change, rename initdb's recently-added
--clobber-cache option to --discard-caches.

Discussion: https://postgr.es/m/1374320.1625430433@sss.pgh.pa.us

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