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Marking a package for removal is fine if we know that we have to remove
that package, but if we are in an alternative branch we might not go
this route in the end and hence have a package pointlessly marked for
removal which isn't questioned later on.
We check if we are allowed to remove that package to avoid working on
the positive dependencies if not, but we mark them for removal only
after all the other dependencies are successfully resolved.
In an ideal world we would let the problemResolver do its job on them,
but the resolver might decide against doing the removal exploring
another option like the next alternative, which might be a good idea,
but is not the behaviour we had before, so that is the best we can do
for now without changing the resolver drastically.
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