testsuite: Normalise trailing digits from hole fits output
The type variables in the holes fit output from `abstract_refinement_hole_fits` is quite sensitive to compiler configuration. Specifically, a slight change in the inlining behavior of `throw` changes type variable naming in `(>>=)` and a few others. Ideally we would make hole fits output more deterministic but in the meantime we simply normalise this difference away as it not relevant to the test's goal.
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