Remove Qwen2 model (#18444)

Removed deprecated Qwen2 7B Instruct model from zed.dev provider (staff
only).

Release Notes:

- N/A

crates/collab/src/tests/test_server.rs

@@ -679,8 +679,6 @@ impl TestServer {
                 stripe_api_key: None,
                 stripe_price_id: None,
                 supermaven_admin_api_key: None,
-                runpod_api_key: None,
-                runpod_api_summary_url: None,
                 user_backfiller_github_access_token: None,
             },
         })