Cleanup perl code from unused variables and routines

Michael Paquier <michael@paquier.xyz>

Commit: 0c1aca461481216ff5a0e65538c4880bcf346433
Author: Michael Paquier <michael@paquier.xyz>
Date: 2024-07-02T00:47:16Z
Releases: 18.0
Cleanup perl code from unused variables and routines

This commit removes unused variables and routines from some perl code
that have accumulated across the years.  This touches the following
areas:
- Wait event generation script.
- AdjustUpgrade.pm.
- TAP perl code

Author: Alexander Lakhin
Reviewed-by: Dagfinn Ilmari Mannsåker
Discussion: https://postgr.es/m/70b340bc-244a-589d-ef8b-d8aebb707a84@gmail.com

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