fix(next/image): allow per-image unoptimized={false} to override images.unoptimized=true

[Kaseax]

What:

• Respect explicit Image prop unoptimized={false} over global images.unoptimized, while retaining auto-unoptimized for data:/blob: and default-loader SVG.

Why:

• Fixes #85208 where a per-image override could not opt back into optimization.

How:

• Compute an effective flag once (should/effectiveUnoptimized) based on: data/blob → true; default loader + SVG (when not allowed) → true; else explicit prop if provided; else config default. Use the resolved flag for generateImgAttrs, meta, and export mode checks.

Tests:

• Added unit tests: test/unit/next-image-get-img-props.unoptimized-override.test.ts

[ijjk]

Allow CI Workflow Run

• approve CI run for commit: df17d46

Note: this should only be enabled once the PR is ready to go and can only be enabled by a maintainer

[ijjk]

Allow CI Workflow Run

• approve CI run for commit: df17d46

Note: this should only be enabled once the PR is ready to go and can only be enabled by a maintainer