Add "fork" logic to button

[GV14982]

Summary

Add the logic to the "fork" button on the recipe detail page.

Motivation

We need the ability to fork a recipe on the frontend.

Additional context

There is already a button for this, but we need to add the actual logic to it.

This will need a new operation web/app/gql/operations/, and use the regular recipe.create mutation.

This is blocked by #56