[Task testing] Add code folding #5598
Description
Problem you would like to solve
Currently, the displayed result is not very human-friendly. I cannot collapse objects which is especially problematic if my output is long.
Proposed solution
Add code folding. This is how it works in the browser devtools and it's already better:
Cf. the JSON renderer in the Modeler:
Alternatives considered
Leave it as is, and let people suffer.
Additional context
Reported via https://camunda.slack.com/archives/C0693F1NFK5/p1770216423995379 (thanks @sbuettner!)