fix: report special opt rule as warning instead of error #4319
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Description
Following up on dfinity/candid#648, we now show a warning when the new Candid declaration is a subtype of the old Candid declaration via a special opt rule (see https://github.com/dfinity/candid/blob/c7659ca/spec/Candid.md#upgrading-and-subtyping for more details).
How Has This Been Tested?
Same tests should pass.
Checklist: