fix: coerce HEAD to GET for internal images (#84180)
Fixes: https://github.com/vercel/next.js/issues/84129
TODO:
- [x] e2e test (?)
- [x] verify against repro steps in source issue
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Co-authored-by: Steven <steven@ceriously.com>
Co-authored-by: vercel[bot] <35613825+vercel[bot]@users.noreply.github.com>
