Verify which style is preferred: `:main-opts` or `:exec-fn`.

[allentiak]

modules/operation-measure-evaluate-measure/deps.edn

 {:extra-deps
   {lambdaisland/kaocha
    {:mvn/version "1.91.1392"}}
   :exec-fn   kaocha.runner/exec-fn

Alex: "I don't know about this new kind of execution config. But if that is now preferred over :main-opts we may use it everywhere?"

Leandro: "I certainly agree in your consistency argument. That being said, I am not sure whether there is a preferred way at all or not - much less which one that would be.

So, I will leave this one open for now so I can research it further later on."