Remove unused wait events.

Amit Kapila <akapila@postgresql.org>

Commit: 1607cd0b6c9919bf765198882ea48a98e901e1bc
Author: Amit Kapila <akapila@postgresql.org>
Date: 2021-10-21T02:31:25Z
Releases: 15.0
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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