next.js

1794f59a - Set Next-Router-Stale-Time header from collected stale times (#71279)

Set Next-Router-Stale-Time header from collected stale times (#71279) That way the client router can use it to inform its cache. This is only done during prerender which is typically the only things we prefetch (other than loading.tsx). I add it to `.meta` but this applies to both the RSC and HTML payloads I believe. I'm not sure if there's away to only add it to the RSC payload. For static parts of the HTML document we need a different strategy than the head so this doesn't work for initial load.