support configuring experiments in workspace settings (#23267)

fixes #23241

Author: DetachHead

package.json

@@ -422,7 +422,7 @@
                 "python.experiments.enabled": {
                     "default": true,
                     "description": "%python.experiments.enabled.description%",
-                    "scope": "machine",
+                    "scope": "window",
                     "type": "boolean"
                 },
                 "python.experiments.optInto": {
@@ -450,7 +450,7 @@
                             "%python.experiments.pythonRecommendTensorboardExt.description%"
                         ]
                     },
-                    "scope": "machine",
+                    "scope": "window",
                     "type": "array",
                     "uniqueItems": true
                 },
@@ -477,7 +477,7 @@
                             "%python.experiments.pythonREPLSmartSend.description%"
                         ]
                     },
-                    "scope": "machine",
+                    "scope": "window",
                     "type": "array",
                     "uniqueItems": true
                 },