Cirrus: Skip deep testing on branches

Previous to this commit, the entire suite of CI tasks run in a PR, run
again for every merge (a.k.a. branch push).  This wastes time and
resources with substantively overlapping testing.  The primary reason
to test on branch-push, is providing coverage for merge-semantics.
In other words, problems introduced due to the sequence of PR merging.
For this purpose, the vast majority of problems can be caught quickly by
a small subset of automated tests.  If deeper debugging is necessary,
then opening a test-PR is a small price to ask for the enormous amount
of time/resource savings with more limited branch-push testing.

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

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