[Mohamedajab]

/_next/image now checks for the avis brand before resizing an AVIF. It returns animated AVIFs as-is and still resizes single-frame AVIFs.

Fixes #4603. The detection follows the avis check added in vercel/next.js#101173.

91 focused tests, pnpm run check, and both production Worker AVIF tests passed. In dev, both image outputs matched expectations, but the animated test failed its cache header assertion. Dev returned no-store, must-revalidate.

[clanky-the-clanker]

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