test: Run unittests with fatal-criticals
test: Run unittests with fatal-criticals

We don't expect any g_critical()s during our tests (as opposed to
warnings), so let's make sure we fail on future problems/bugs.

Closes #5905
Reviewed-by: Dominik Perpeet <f7830b2723a5db4fc185058b06cfab4b89a38da9@redhat.com>

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