Finish phpunit v12 migration

[simPod]

No description provided.

[simPod]

I have added basic CI for this so we know when it gets broken.

Locally it works for me now

PHPUnit 12.4.3 by Sebastian Bergmann and contributors.
Runtime: PHP 8.4.12
Configuration: .../ext-ds-tests/phpunit.xml.dist
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Time: 00:01.413, Memory: 30.00 MB
OK (3292 tests, 8911 assertions)