Auto merge of #25087 - bblanke:OffscreenCanvasasCanvasImageSoure, r=jdm

Support OffscreenCanvas as CanvasImageSource

Added methods to canvas_data to support drawing an offscreen canvas onto another canvas
Bug fix: Swapped OffscreenCanvas width and height parameters to match Mozilla spec
Tests: Updated metadata for 866 tests

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- [x] `./mach build -d` does not report any errors
- [x] `./mach test-tidy` does not report any errors
- [x] These changes fix #24269 (GitHub issue number if applicable)

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- [x] These changes do not require tests because they are covered by existing tests

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