WIP: Migrate testing workflows to reusable workflows

[robin-checkmk]

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Use the devel branch as the merge target (see dropdown above)!
We use that branch as a staging area, to make sure the main branch
stays as stable as possible, in case people are using it to install the collection directly.

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ToDo:

• Improve naming of Workflows (see below)
• Look at remaining tests (those with specific version or edition constraints) and find solution