tidy: Add ignore-rules for the line length check This is step 1 towards fixing https://github.com/rust-lang/rust/issues/77548. This PR contains the `tidy` change from https://github.com/rust-lang/rust/pull/77675. The "ignoring file length unnecessarily" check is temporarily disabled to simplify landing the ignore-rules. This check will be re-enabled in a follow-up PR.
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