fix: revert "monadic generalization of FindExpr" #4125
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This reverts commit 706a4cf.
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This reverts commit 706a4cf introduced in #3970
As explained in #4124,
findM?can become a footgun if used in monads which induce side-effects such as caching. This PR removes that function, and fixes the code introduced by #3398 for which the function was first added.cc @semorrison.