Configurable cache nginx upload limit prevents remote cache upload failures

The Tuist Helm chart now includes a configurable upload limit for the cache nginx sidecar. The new value is exposed as cache.nginx.clientMaxBodySize and defaults to 10m, matching the cache application’s own module part size limit. Upload proxy paths also disable request buffering so module parts stream through to the cache application instead of being blocked or buffered by nginx. This prevents remote cache module uploads from being rejected with a 413 Request Entity Too Large error before they reach the cache application.