Only show dependencies tree on Ruby projects (#1033)

package.json

@@ -323,7 +323,8 @@
           "name": "Dependencies",
           "icon": "$(package)",
           "description": "View and manage dependencies",
-          "contextualTitle": "Dependencies"
+          "contextualTitle": "Dependencies",
+          "when": "rubyLsp.activated"
         }
       ]
     },

src/rubyLsp.ts

@@ -169,6 +169,10 @@ export class RubyLsp {
 
     await workspace.start();
     this.context.subscriptions.push(workspace);
+
+    // If we successfully activated a workspace, then we can start showing the dependencies tree view. This is necessary
+    // so that we can avoid showing it on non Ruby projects
+    vscode.commands.executeCommand("setContext", "rubyLsp.activated", true);
   }
 
   // Registers all extension commands. Commands can only be registered once, so this happens in the constructor. For