Dashboard: Better UX for JSON when executing workflows

[HazimAr]

Currently, users have to input their JSON in plain string format. This comes with a ton of downsides

• For people who are not technical they wont really understand what JSON is or how to use it.
• Users can mess up the JSON schema and miss a } or , very easily
• For JSON_ARR its hard to see all your objects you have in the array

JSON_ARR & JSON_OBJ need better UX that allows people to use UI instead of passing in a plain string.

This will

• we can sanitize the JSON to make sure it's correct before sending it to the server.
• people can mess up JSON if they use a plain string.
• less technical people will be able to interact with it.
• they should be able to add and remove objects or properties with buttons.

We do not have to force the user to use the UI for building JSON objects, we can have a "advanced mode" that will allow the user to just put in plain text.

This doesn't have to be in the same PR if we want to push this way to prod, but we need to keep track of that improvement if we decide.

Originally posted by @HazimAr in #1134 (comment)