next.js

c470e1c0 - Add NEXT_SSG_FETCH_METRICS flag to control fetch metrics during SSG (#68378)

Add NEXT_SSG_FETCH_METRICS flag to control fetch metrics during SSG (#68378) This PR allows the users to set `process.env.NEXT_SSG_FETCH_METRICS` to output fetch metrics during SSG of a build to separate it from `NEXT_DEBUG_BUILD` which may affect other output. Co-authored-by: JJ Kasper <jj@jjsweb.site>