ssbc: Add caching info to UI
Created by: eseliger
Exposes the caching info we introduced in EM2.3-CACHE-1. Works on https://github.com/sourcegraph/sourcegraph/issues/26929
Created by: eseliger
Exposes the caching info we introduced in EM2.3-CACHE-1. Works on https://github.com/sourcegraph/sourcegraph/issues/26929