Placeholder: review how to display default values for nested arguments

[tcompa]

This stems from the report in #537, also reviewed in #538.

It's clear that it should be somehow possible to display default values for nested arguments even when some JSON data are set, see e.g. this https://rjsf-team.github.io/react-jsonschema-form/ example:

One likely complexity is that we generally strip null or empty values (ref #209), and we will likely need to review this approach as well when we start handling nested arguments.

[tcompa]

For the moment this was fixed in fractal-server 1.3.6, where we stopped pre-populating the defaults from the backend.
Refs

• Deprecate pre-populating default arguments based on JSON Schemas? fractal-server#1686
• Do not set default argument values from JSON Schemas fractal-server#1688

Right now, the behavior in the webclient when a task is added for the first time is the same as in the sandbox.

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We can still review the web-client behavior in the future, based on more specific example use cases or edge cases.