List the explicitly installed extensions that require a given extension (installed as dependency)

With XWIKI-10323 the user should be able to see which extensions have been installed directly (explicitly by him or another user) and which have been installed indirectly / automatically (by the Extension Manager) as dependencies.

It would also help to see quickly what explicitly installed extensions depend on a given extension. Suppose you notice an extension that was installed as dependency and you want to know why it was installed (who brought it?). Right now you have to look at the "Dependencies" tab and click on the backward dependencies until you reach the ones that have been installed directly. Would be better if there is a button/link to do this for you: "List the explicitly installed extensions that require this extension".