Both are basically special groups, which we do not use.
But they also had a special meaning in the past which now only works
when set on the test class: They set the test timeout.
So for `@small` we just remove them, for `@medium` we remove where not
needed but keep it on the class where the full test class might make use
of the adjusted timeout.
Signed-off-by: Ferdinand Thiessen <opensource@fthiessen.de>
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