Better indication that a remote kernel is connected

[miguelsolorio]

Testing microsoft/vscode#133905

When connected to a remote kernel, the server in the status bar mentions you are on a remote but the kernel doesn't mention anything:

Same thing in the kernel picker, I assume that when I am "connected" to a remote kernel that there is some indicator that helps identify it:

I think having either some icon or a text label in the kernel picker that says "Remote" would help in this situation

[miguelsolorio]

Also related, when reloading a couple of times and trying different files I noticed the kernel picker getting polluted (not sure if this should be a separate issue):

[greazer]

Related to #7598

[zpincus]

This little UI doodad in the status bar used to change to indicate whether a kernel was connected or not... now it just always shows the "unplugged" state. Not sure if that was by intent, but the old indicator was useful.

[DonJayamanne]

This will be fixed with the new kernel picker