Refactor 'RelaxDeps' to avoid semantic ambiguity of mempty value
This removes the redundancy between `RelaxDepsNone` and `RelaxDepsSome []` by removing `RelaxDepsNone`. This way we avoid the risk of subtle bugs that can occur if the same semantic value can be expressed in a non-unique way. A further step to normalise the type would be to turn `[RelaxedDep]` into `Set RelaxedDep`, but there is no operation that would significantly benefit from that yet.
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