enh(settings): Add and remove groups accessibly

[Pytal]

• Base branch (merge first) fix: Scope app nav caption styles #40858
• For [BITV] 9.3.3.2/8.2 - The "Add group" input field does not have a visual label, it only has a placeholder element. (1) #37090

Summary

Before	After

TODO

• Tests

Checklist

• Code is properly formatted
• Sign-off message is added to all commits
• Tests (unit, integration, api and/or acceptance) are included
• Screenshots before/after for front-end changes
• Documentation (manuals or wiki) has been updated or is not required
• Backports requested where applicable (ex: critical bugfixes)

[Pytal]

@Pytal I would still prefer to have a heading in the menu that states what's the current operation that the user is undergoing, similar to contacts.

Something like heading of the tooltip "Create group" Label of the input: "Group name"

Done!

Also moved the actions next to the "Groups" navigation caption

[ShGKme]

Works and looks good. But we should avoid using $children when possible.