Add a test for commit ac0e33136a using the injection point.

Add a test for commit ac0e33136a using the injection point.

This test uses an injection point to bypass the time overhead caused by
the idle_replication_slot_timeout GUC, which has a minimum value of one
minute.

Author: Hayato Kuroda <kuroda.hayato@fujitsu.com>
Author: Nisha Moond <nisha.moond412@gmail.com>
Reviewed-by: Peter Smith <smithpb2250@gmail.com>
Reviewed-by: Vignesh C <vignesh21@gmail.com>
Reviewed-by: Amit Kapila <amit.kapila16@gmail.com>
Discussion: https://postgr.es/m/CALj2ACW4aUe-_uFQOjdWCEN-xXoLGhmvRFnL8SNw_TZ5nJe+aw@mail.gmail.com