cirrus: remove redundant skip logic and lower int timeout

[Luap99]

cirrus: remove redundant skip logic

As of commit https://github.com/containers/podman/commit/d9183f0587950b8bdaebbc1ffe321965cb026397 we use the cirrus.yml skip logic to skip based on source changes. As such the add hoc logic inside our test setup can be removed. However as I did not yet implement the skip logic for all tests task in cirrus.yml it must remain for the other tasks for now. I plan to migrate the other in a week or two once we are confident that the cirrus.yml logic works well for us.

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cirrus: reduce int tests timeout

Integration tests run around 15-20 mins now. Lower the timeout to 30m, if we hit this something is very wrong and needs to be looked at and there is no point in waiting much longer in case of a hang.

Does this PR introduce a user-facing change?

None

[openshift-ci[bot]]

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[ashley-cui]

LGTM

[rhatdan]

/lgtm