Model change detected because of newlines across Windows/Unix

[roji]

SQL strings in various parts of the model (e.g. default value SQL, filters...) may embed newlines, and if they do, falsely trigger a model change (and therefore a PendingModelChangesWarning). We should consider normalizing newlines for the purpose of model diffing to prevent this.

Reported by @dcby in #35285 (comment)