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lint: add diagnostic translation migration lints Introduce allow-by-default lints for checking whether diagnostics are written in `SessionDiagnostic` or `AddSubdiagnostic` impls and whether diagnostics are translatable. These lints can be denied for modules once they are fully migrated to impls and translation. These lints are intended to be temporary - once all diagnostics have been changed then we can just change the APIs we have and that will enforce these constraints thereafter. r? `````@oli-obk`````