Supporting Different Kernel JSONs for Various Platforms (#7552)

* First go at it

* undo unnecessary change to copy api

* Revert "undo unnecessary change to copy api"

This reverts commit f95f7f7a42277586f4d4d0eb7b0733c11853b413.

* Revert "First go at it"

This reverts commit 410c0d3c61b7c7cae3a2469a2672f67fe3b745b6.

* Actual super simple fix

extensions/notebook/kernels/powershell/kernel.json

@@ -7,8 +7,5 @@
 		"{connection_file}"
 	],
 	"display_name": "PowerShell",
-	"env": {
-		"powershell_command": "powershell"
-	},
 	"language": "powershell"
 }