Cirrus: Combine pre-test checks into build task

Previously, two tasks always ran first, prior to anything else.  One to
verify network and external-service connectivity.  Another to verify
certain important `.cirrus.yml` standards are met.  However, as the
total number of tasks continues to grow, the need to keep these basic
checks as dedicated prerequisites is of decreasing value/importance.
Fold these two checks into a new `pretesting_script` component of the
Fedora `build` task, on both `x86_64` and `aarch64`.

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

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