test_shm_mq: Replace WAIT_EVENT_EXTENSION with custom wait events

Michael Paquier <michael@paquier.xyz>

Commit: 3338a9838298c4b42e2829373f70228c4fc50652
Author: Michael Paquier <michael@paquier.xyz>
Date: 2023-10-04T08:12:25Z
Releases: 17.0
test_shm_mq: Replace WAIT_EVENT_EXTENSION with custom wait events

Two custom wait events are added here:
- "TestShmMqBgWorkerStartup", when setting up a set of bgworkers in
wait_for_workers_to_become_ready().
- "TestShmMqMessageQueue", when waiting for a queued message in
test_shm_mq_pipelined().

Author: Masahiro Ikeda
Discussion: https://postgr.es/m/197bce267fa691a0ac62c86c4ab904c4@oss.nttdata.com

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