/auto (#16696)

Add `/auto` behind a feature flag that's disabled for now, even for
staff.

We've decided on a different design for context inference, but there are
parts of /auto that will be useful for that, so we want them in the code
base even if they're unused for now.

Release Notes:

- N/A

---------

Co-authored-by: Antonio Scandurra <me@as-cii.com>
Co-authored-by: Marshall Bowers <elliott.codes@gmail.com>

crates/collab/src/tests/test_server.rs

@@ -679,8 +679,8 @@ impl TestServer {
                 stripe_api_key: None,
                 stripe_price_id: None,
                 supermaven_admin_api_key: None,
-                qwen2_7b_api_key: None,
-                qwen2_7b_api_url: None,
+                runpod_api_key: None,
+                runpod_api_summary_url: None,
                 user_backfiller_github_access_token: None,
             },
         })