Use `BTreeSet` as the internal type of `ParachainsCache` (#6795)
* Add tests for ParachainsCache * Use BTreeSet for ParachainsCache internals * Use `into_iter()` instead of cloneing storage vals
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* Add tests for ParachainsCache * Use BTreeSet for ParachainsCache internals * Use `into_iter()` instead of cloneing storage vals