tests/functional: Convert the multiprocess avocado test into a standalone test

This test handles both, aarch64 and x86_64, with the same test code
(apart from some initial setup), so don't split thi

tests/functional: Convert the multiprocess avocado test into a standalone test

This test handles both, aarch64 and x86_64, with the same test code
(apart from some initial setup), so don't split this file by target
but add a check for self.arch in the main test function.

Message-ID: <20240903051333.102494-1-thuth@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>

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