'Install chat extensions' view feels odd

[mjbvz]

Testing #264256

Instead of showing this picker, can we open the extensions view? I think we typically do this by showing extensions with a specific tag

[roblourens]

Yes, but if we need the picker for some reason, the item should be checked and disabled IMO

[joshspicer]

The item is disabled in the screenshot. I didn't check it since it would then be in the result of the picker, which is kind of annoying. Is there a way to show the state as 'checked' but not have it end up in the result?