add `spirv-unknown-naga-wgsl` target via naga #692

Job	Run time
Android (ubuntu-24.04, aarch64-linux-android)	8m 27s
Lint	6m 49s
Compiletest (ubuntu-24.04, vulkan1.1,vulkan1.2,vulkan1.3,vulkan1.4, false)	7m 36s
Test (windows-2022)	15m 38s
Compiletest (windows-2022, vulkan1.1,vulkan1.2,vulkan1.3,vulkan1.4, false)	15m 29s
Test (macOS-latest)	7m 51s
Test (ubuntu-24.04)	9m 40s
cargo-deny	1m 26s
Difftest (ubuntu-24.04)	10m 47s
Compiletest (macOS-latest, vulkan1.1,vulkan1.2,vulkan1.3,vulkan1.4, false)	6m 27s
Compiletest (ubuntu-24.04, naga-wgsl, true)	4m 25s
Difftest (windows-2022)	18m 28s
Difftest (macOS-latest)	13m 26s
test_success	4s
	2h 6m 33s

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