Result<'ok, 'leftError> -> Result<'ok, 'rightError> -> Result<'ok, 'leftError * 'rightError>
let result = Result.zipError (Ok 1) (Ok 2)
// Ok 1
let result = Result.zipError (Ok 1) (Error "Bad")
// Ok 1
let result = Result.zipError (Error "Bad1") (Error "Bad2")
// Error("Bad1", "Bad2")