Cirrus: Ability to skip most tests for docs updates

***Warning***: `skip` has non-obvious side-effects vs `only_if`:
https://cirrus-ci.org/guide/writing-tasks/#conditional-task-execution

The skip instruction can give a false sense of security by always
marking tasks as passed in the UI, even if they didn't run. In
contrast, the `only_if` condition will avoid creating the task
all -together; therefore, a problematic task's absense is more likely to
be noticed if it introduced a problem.

Signed-off-by: Chris Evich <cevich@redhat.com>

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