Simplify preparations conditional (and fix it)

[robin-checkmk]

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What is the current behavior?

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Locally running the integration tests fails, as Ansible tooling was updated and detects the runtime environment differently.

What is the new behavior?

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This PR simplifies the conditionals to detect, where the tests are running, including a fix for the aforementioned issue.

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[robin-checkmk]

This was locally cherry-picked into devel.
44df3f3