Add required field indicators to labels

[bl-nero]

This PR unifies the way we display labels across different types of input fields and adds consistent support for required field markers and info tooltips. Actually reusing these in places where fields are created manually, circumventing the built-in input fields, is not in the scope.

Tested:

• in Storybook
• in the role editor (with a follow-up PR that applies these to selected fields)
• app connection UI in teleterm

Contributes to #52036
Followed up by #52345

[avatus]

Looks fine to me. Idk why seeing the label content as a child of the input doesn't sit well with me but, i won't die on that hill. (and maybe its normal, idk? never really used label inputs enough to know i guess)

[bl-nero]

Looks fine to me. Idk why seeing the label content as a child of the input doesn't sit well with me but, i won't die on that hill. (and maybe its normal, idk? never really used label inputs enough to know i guess)

@avatus Label content is never a child of the input, it's just the name that is confusing (and we might want to simply rename it someday). LabelInput is actually an "input label".