[Feature Request]: Display location of metadata elements

### What would you like to happen?

When editing metadata elements in the Hop GUI, it's not clear where the changes are stored when working with parent projects.
I would propose to add a header right below the tab and above the metadata widgets indicating where exactly the metadata JSON is stored.

Perhaps a small warning triangle should be shown if the metadata element is not contained within the current project home folder or below.

### Issue Priority

Priority: 3

### Issue Component

Component: Hop Gui