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Add structured diagnostics for some TcRn errors in Validity

Ben Bellick requested to merge benbellick/ghc:convert-diags-in-tc-validity into master

This is a preliminary merge beginning to address #20118 (closed) It introduces the following constructors to TcRnMessage from Validity.hs:

  • TcRnInaccessibleCoAxBranch
  • TcRnPatersonCondFailureTyVar

There is some complexity surrounding the funneling of all Paterson condition failures into one error that I would particularly like feedback on.

Edited by Ben Bellick

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