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core(ImageElements): add usesPixelArtScaling and usesSrcSetDensityDescriptor properties (#10481)

* feature: add usesPixelArtScaling flag to images

This new flag will be used by the ImageSizeResponsive audit (#10245), as those images are intendedly displayed in a pixelated form, so the audit should not flag them.

Note that `image-rendering: -mo-crisp-edges;` is also an accepted value in Firefox, however in such case, the computed style will return `crips-edges`.

* Fix how usesPixelArtRendering is computed

Apparently the code is executed in another process, which means, that functions mus be inlined, otherwise the code needs to go through some extra hoops.

* Add usesSrcSetDensityDescriptor

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