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fix(lints): Fail when overriding inherited lints ### What does this PR try to resolve? Overriding of inherited lints was reserved for the future but as pointed out in https://github.com/rust-lang/cargo/issues/12115#issuecomment-1695293006, we aren't failing on these when we should but silently ignoring the overrides. This turns it into a hard error. In fixing this, I had to add a `#[serde(expecting)]` attribute to maintain behavior on an error case (otherwise it would say "expecting struct WorkspaceLints"). Since this drew the error message to my attention, I also tweaked it to make it more specific. ### How should we test and review this PR? Commits are broken down by the relevant tests and fixes to make the intended behavior changes obvious.