Gate WSFS and docs panels on extension activation (#1909)

## Changes

Both views used `!databricks.context.remoteMode` which is always true on
startup, causing VSCode to render them before data providers were
registered and leak "There is no data provider registered that can
provide view data" to users.

## Tests

Manually

Author: misha-db

packages/databricks-vscode/package.json

@@ -532,7 +532,7 @@
                 {
                     "id": "workspaceFsView",
                     "name": "Workspace file system",
-                    "when": "!databricks.context.remoteMode"
+                    "when": "databricks.context.activated && !databricks.context.remoteMode"
                 },
                 {
                     "id": "unityCatalogView",
@@ -542,7 +542,7 @@
                 {
                     "id": "databricksDocsView",
                     "name": "Documentation",
-                    "when": "!databricks.context.remoteMode"
+                    "when": "databricks.context.activated && !databricks.context.remoteMode"
                 }
             ]
         },