Cirrus: Simplify only_if/skip + optimize multiarch

Using both the 'skip' and 'only_if' features at the same time may be
hard for maintainers to decipher.  Consolidate them into `only_if` since
that bypasses creation of the task all together - meaning there are
potentially fewer tasks for a developer to scroll through.

Since the `multiarch` Cirrus-Cron build no-longer depends on the direct
"build-ability" from the current repo. state, it can be further
optimized.  When operating in this context, avoid running many/most
other tasks, depending instead only on `ext_svc_check`.

Finally, add a simple document describing the various runtime contexts
along with the list of expected tasks.  Reference this prominently right
in front of every `only_if` so it's impossible for a maintainer to miss.

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

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