[NFC] Convert Deprecations in tests to exceptions

[seamuslee001]

Overview

title sys it all

This returns the situation to before phpunit 8.5.21 https://github.com/sebastianbergmann/phpunit/blob/main/ChangeLog-8.5.md#8521---2021-09-25

[civibot]

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[seamuslee001]

I merged this so that no other problems crop up in other test runs