[Merged by Bors] - fix: ring: use whnfR when obtaining goal
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Adds `whnfR` so that goals which are e.g. equalities with metadata are recognized by `ring`. See [zulip](https://leanprover.zulipchat.com/#narrow/stream/287929-mathlib4/topic/Bug.20in.20.60ring1.60.3F).
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ring: use whnfR when obtaining goalring: use whnfR when obtaining goal
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Adds
whnfRso that goals which are e.g. equalities with metadata are recognized byring. See zulip.