Merge #6766

6766: Add client install support for `code-exploration` builds. r=lnicola a=derdaele

VSCode has a feature to install the command to the PATH.
<img width="640" alt="Capture d’écran 2020-12-08 à 19 25 43" src="https://user-images.githubusercontent.com/16373039/101525141-2e013300-398b-11eb-8d07-60a92ae9587c.png">

`code-exploration` is the command name for the ARM64 experimental build. As of today, this is the only build running natively on Apple Silicon.

See _ARM64_ Experimental in https://code.visualstudio.com/insiders/#osx.

The `-exploration` prefix seems pretty undocumented, my understanding of it is that it is an insider-like version that uses a different electron version (in this case, maybe the election version that was recently ported to Apple Silicon?).

Co-authored-by: Jérémy <jeremy.derdaele@gmail.com>