Components: rework focus/blur callback behavior across composite components

[ciampo]

What problem does this address?

We should align composite components with focusable sub-components (e.g. UnitControl, RangeControl, ...) so that they share the same behavior when it comes to how the onFocus/onBlur callbacks are fired

See #39589 (review) for more details

What is your proposed solution?

• List components that need to be addressed
• For each component, make sure that the onFocus and onBlur callbacks fire if any sub-component is focused or blurred

List of components

• UnitControl
  • onBlur (UnitControl: forward onBlur prop as expected #39589)
  • onFocus
• RangeControl
  • onBlur
  • onFocus
• ...

[github-actions]

Hi,
This issue has gone 180 days without any activity. This means it is time for a check-in to make sure it is still relevant. If you are still experiencing this issue with the latest versions, you can help the project by responding to confirm the problem and by providing any updated reproduction steps.
Thanks for helping out.

[ciampo]

This issue is still relevant, but we'll need to assess the status of the components mentioned above as we're in the process of introducing SlideControl (and later deprecate RangeControl) as per #40507