Make the "hide profile from dropdown" profile setting more easily discoverable

### Description of the new feature

I rarely open my Windows Terminal settings, but when I do it's very frequently to edit what profiles are in the dropdown. Almost everytime I'm like scanning the profile settings looking for a "Show" option or "Enabled/Disabled" option. Eventually the lengthy "Hide profile from dropdown" catches my eye, but it always takes a while because it's at the bottom of all the other appearence options.

Mentally I consider that option as like one of the "main" options of not *the* main option, and I think it should be a little more easy to change at just a glance.

### Proposed technical implementation details

A few ideas, ideally could implement all of them:
- A clickable toggle button that switches between an Eye icon and a, placed either within the profile's sidebar row or next to the Profile Settings page title.
- Move the setting to the top of the settings list.
- Rename to just "Hide profile" so it can be more easily while skimming.
- (Way more work) Adding icons to all of the profile settings to aid skimming, this alone could help but doing the above three is better IMO.

The issue names no files, tests, or entry points. Start by locating the profile settings UI and its existing “Hide profile from dropdown” control, then compare the proposed placement, label, and toggle behavior. Done means the setting is noticeably easier to find and the selected behavior works consistently.

Written by the indexing model from the issue text.