Pmc: Don't case split on wildcard matches (#20642)

Since 8.10, when formatting a pattern match warning, we'd case split on a wildcard match such as

foo :: [a] -> [a]
foo [] = []
foo xs = ys
  where
  (_, ys@(_:_)) = splitAt 0 xs
-- Pattern match(es) are non-exhaustive
-- In a pattern binding:
--     Patterns not matched:
--         ([], [])
--         ((_:_), [])

But that's quite verbose and distracts from which part of the pattern was actually the inexhaustive one. We'd prefer a wildcard for the first pair component here, like it used to be in GHC 8.8.

On the other hand, case splitting is pretty handy for -XEmptyCase to know the different constructors we could've matched on:

f :: Bool -> ()
f x = case x of {}
-- Pattern match(es) are non-exhaustive
-- In a pattern binding:
--     Patterns not matched:
--         False
--         True

The solution is to communicate that we want a top-level case split to generateInhabitingPatterns for -XEmptyCase, which is exactly what this patch arranges.

Fixes #20642 (closed).

I also cleaned up the all.T file of the testsuite in a separate commit.