tests/functional: Move the generic tests to a subfolder

This also removes the line for using tests from the main folder
since we do not have any tests left here. And while we're at it,
also mark the vnc test as generic now since it is not specific to x86.

Reviewed-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
Signed-off-by: Thomas Huth <thuth@redhat.com>
Message-ID: <20250819112403.432587-25-thuth@redhat.com>
8 files changed