Simulate time passage instead of actually waiting in EntityTestMulChanged

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Updated patch for 9.5.x, we'll see if the test bot can apply it to 10.x.

This change looks great, we need to update phpstan base level though.

Fixed failed commands on #58
Attached patch against Drupal 10.1.x

Patch does not apply. Needs a rebase I think.

Rerolled patch #60, please review it.

Will just repeat #59

> This change looks great, we need to update phpstan base level though.