chore: Add backend installation tasks to VSCode configuration (#4335)

* Add separate task for installing backend in VSCode tasks configuration

* Add preLaunchTask to launch.json for backend installation

.vscode/launch.json

@@ -6,6 +6,8 @@
       "type": "debugpy",
       "request": "launch",
       "module": "uvicorn",
+      "preLaunchTask": "Install Backend",
+
       "args": [
         "--factory",
         "langflow.main:create_app",

.vscode/tasks.json

@@ -43,6 +43,12 @@
       "label": "Install",
       "type": "shell",
       "command": "make install_backend && make install_frontend"
+    },
+    // install backend
+    {
+      "label": "Install Backend",
+      "type": "shell",
+      "command": "make install_backend"
     }
   ]
 }