Revert "Remove unused wait events."

Amit Kapila <akapila@postgresql.org>

Commit: a6a0ae127e76da58e0396cd0f21a97066da2115b
Author: Amit Kapila <akapila@postgresql.org>
Date: 2021-10-26T02:49:33Z
Releases: 14.1
Revert "Remove unused wait events."

This reverts commit 671eb8f34404d24c8f16ae40e94becb38afd93bb. The removed
wait events are used by some extensions and removal of these would force a
recompile of those extensions. We don't want that for released branches.

Discussion: https://postgr.es/m/E1mdOBY-0005j2-QL@gemulon.postgresql.org

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