TreeView: review "nestedKey" prop

[julien]

In order to render a nested tree, I'm seeing that it's required to pass
the nestedKey prop. Maybe we should add a default value here.

@matuzalemsteles tell me what you think when you get a chance.

[matuzalemsteles]

I don't see a problem with adding since we have the nestedKey prop that can change, that's because in some places in DXP the property names are different depending on the application, children is just a more common term for us.

[julien]

@matuzalemsteles take out the "nestedKey" prop in the stories (before this change) and look at what happens: nested node aren't rendered

[matuzalemsteles]

@julien yeah, this is the expected behavior as I commented in all the messages in the TreeView PRs, the idea is to be data agnostic so we are not opinionated about this property, it is a required property for the dynamic TreeView state.

Don't get me wrong, I'm just saying that I don't see a problem with adding a default value once we have a way to configure it.

[github-actions]

This issue has been merged and will be released in DXP at https://issues.liferay.com/browse/LPS-144571