[WebGPU] copy compressed textures fails when texture width is not divisible by the block size

[mwyrzykowski]

edb411c

[WebGPU] copy compressed textures fails when texture width is not divisible by the block size
https://bugs.webkit.org/show_bug.cgi?id=264923
radar://118491364

Reviewed by Tadeu Zagallo.

To correctly write to compressed textures, the width of the data must be divisible
by the compressed texture's block size and we were not previously ensuring that.

Also clean up newBytesPerRow and levelInfoBytesPerRow duplication which were being
assigned the same value and never modified.

* LayoutTests/http/tests/webgpu/webgpu/api/operation/command_buffer/copyTextureToTexture-expected.txt:
Add test expectation as this passes locally.

* Source/WebGPU/WebGPU/Queue.mm:
(WebGPU::Queue::writeTexture):

Canonical link: https://commits.webkit.org/270881@main

57bc0b7

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	✅ 🛠 ios-sim	✅ 🛠 mac-AS-debug	✅ 🧪 wpe-wk2
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✅ 🛠 🧪 merge	✅ 🛠 watch
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[webkit-early-warning-system]

EWS run on current version of this PR (hash 57bc0b7)

Misc	iOS, tvOS & watchOS	macOS	Linux	Windows
✅ 🧪 style	✅ 🛠 ios	✅ 🛠 mac	✅ 🛠 wpe	✅ 🛠 wincairo
	✅ 🛠 ios-sim	✅ 🛠 mac-AS-debug	✅ 🧪 wpe-wk2
✅ 🧪 webkitperl	✅ 🧪 ios-wk2	✅ 🧪 api-mac	✅ 🧪 api-wpe
	✅ 🧪 ios-wk2-wpt	✅ 🧪 mac-wk1	✅ 🛠 gtk
	✅ 🧪 api-ios	✅ 🧪 mac-wk2	✅ 🧪 gtk-wk2
	✅ 🛠 tv	✅ 🧪 mac-AS-debug-wk2	✅ 🧪 api-gtk
	✅ 🛠 tv-sim
✅ 🛠 🧪 merge	✅ 🛠 watch
	✅ 🛠 watch-sim

[webkit-commit-queue]

Committed 270881@main (edb411c): https://commits.webkit.org/270881@main

Reviewed commits have been landed. Closing PR #20588 and removing active labels.