Don't insert build id comment in HTML (#89478)
The build id comment in HTML documents was added in https://github.com/vercel/next.js/pull/81247
But it was removed again to detect redirects using a HEAD request instead in https://github.com/vercel/next.js/pull/85910
Meaning the build id comment is completely unused now, so no need to insert it
see https://vercel.slack.com/archives/C04KC8A53T7/p1770196901369359
Closes PACK-6846
