Optimization: skip tests in some circumstances

A common pattern is to submit PRs that update only tests or docs.

When the only changes are to test/e2e, there is no point in running
test/system or test/upgrade or test/buildah-bud. Likewise, reciprocally,
and similarly for a bunch of other tests (alt, cross, apiv2, ...)

And when the only changes are under docs/ , there is no point in
running any of the above.

Exception: if $CIRRUS_<mumble> are undefined (e.g., cron), never skip

Signed-off-by: Ed Santiago <santiago@redhat.com>

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