[WebGPU] Fix RenderPipeline color format validation

[achristensen07]

0756f8a30b32823b6da2b7d970481fa7cf37dade

[WebGPU] Fix RenderPipeline color format validation
https://bugs.webkit.org/show_bug.cgi?id=270333
rdar://123810621

Reviewed by NOBODY (OOPS!).

If fragment.targetCount is not equal to descriptor.colorFormatCount then we want to
verify that all color formats are undefined.  Otherwise, we want to verify that they
are all equal to the descriptor color formats.

* LayoutTests/fast/webgpu/render-bundle-validation-color-format-expected.txt: Added.
* LayoutTests/fast/webgpu/render-bundle-validation-color-format.html: Added.
* Source/WebGPU/WebGPU/RenderPipeline.mm:
(WebGPU::RenderPipeline::validateRenderBundle const):

https://github.com/WebKit/WebKit/commit/0756f8a30b32823b6da2b7d970481fa7cf37dade

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
⏳ 🛠 🧪 jsc	🧪 api-ios	🧪 mac-wk2	⏳ 🧪 gtk-wk2
	✅ 🛠 tv	🧪 mac-AS-debug-wk2	✅ 🧪 api-gtk
	✅ 🛠 tv-sim	✅ 🧪 mac-wk2-stress
	🛠 watch
	✅ 🛠 watch-sim

[webkit-early-warning-system]

EWS run on previous version of this PR (hash https://github.com/WebKit/WebKit/commit/c41dfd72ae5fd3523de62ed091f751e3001f384c)

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	✅ 🧪 mac-wk2-stress
	✅ 🛠 watch
	✅ 🛠 watch-sim

[webkit-early-warning-system]

EWS run on current version of this PR (hash https://github.com/WebKit/WebKit/commit/0756f8a30b32823b6da2b7d970481fa7cf37dade)

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	✅ 🧪 mac-wk2-stress
	✅ 🛠 watch
✅ 🛠 🧪 unsafe-merge	✅ 🛠 watch-sim

[webkit-commit-queue]

Committed 275550@main (fcdb5d4b016f): https://commits.webkit.org/275550@main

Reviewed commits have been landed. Closing PR #25337 and removing active labels.