update default value for workspaceSearchPath (microsoft#1419)

as an intermediate option to setting the `"default": [],`. I want to
give this an attempt to see if we can improve performance without fully
removing workspace searching.

related to:
microsoft#1362

Author: eleanorjboyd

package.json

@@ -124,7 +124,7 @@
                 "python-envs.workspaceSearchPaths": {
                     "type": "array",
                     "description": "%python-envs.workspaceSearchPaths.description%",
-                    "default": ["./**/.venv"],
+                    "default": [".venv", "*/.venv"],
                     "scope": "resource",
                     "items": {
                         "type": "string"