Don't use completions for cabal file codeactions

At the moment, codeactions (PR: #3273) in cabal files put a cursor at the end of the misspelled word and then suggest any possible completions.
This is not ideal, since words that have a typo early on will not trigger the correct codeaction.
We should use a different algorithm for the fuzzy matching than completions to better support the semantics of the codeactions.