Admin UI: add toggles to deactivate hidden modules.

This is based on the feedback we received here:

> While #7183 will help users activate modules, it won't allow them to easily deactivate existing features. I think it can be confusing in some specific situations, like here:
>
> 
>
> It's hard to understand here why I can disable one feature but not the other.

Let's use this issue as a place to discuss whether we could consider adding a toggle to deactivate those hidden modules.

Start by reviewing the issue discussion and the linked screenshot to understand the inconsistency between visible and hidden module controls. No files, tests, or entry points are identified, so first locate the Admin UI module settings and clarify the intended toggle behavior. Done means the expected deactivation flow for hidden modules is agreed and implemented.

Written by the indexing model from the issue text.