Add horizontal scrolling to the Components tree

[pichfl]

Description

• Adds horizontal scrolling support to ensure deeply nested components remain visible by updating the scroll target positioning to account for item indentation
• Adds missing accessibility title to the button

Closes #2614

[mansona]

very close, one very very very minor change. Happy to merge without fixing it tbh

[mansona]

thank you 🎉

[mansona]

I tested the built package and it looks like we introduced a bug 😞 now when you have selected a component, as you hover over other components in the tree it will "jump" you back to the left-right scroll position of the selected component.

I was on a call with @pichfl when I discovered this and he saw the behaviour so I won't provide a video but I can if we need to 👍

[pichfl]

I've updated my code. It does the job, but I'm not convinced of the usefulness of this feature.