Remove unused wait events.

Amit Kapila <akapila@postgresql.org>

Commit: 671eb8f34404d24c8f16ae40e94becb38afd93bb
Author: Amit Kapila <akapila@postgresql.org>
Date: 2021-10-21T02:37:08Z
Releases: 14.1
Remove unused wait events.

Commit 464824323e introduced the wait events which were neither used by
that commit nor by follow-up commits for that work.

Author: Masahiro Ikeda
Backpatch-through: 14, where it was introduced
Discussion: https://postgr.es/m/ff077840-3ab2-04dd-bbe4-4f5dfd2ad481@oss.nttdata.com

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