add `spirv-unknown-naga-wgsl` target via naga #691

Job	Run time
Test (ubuntu-24.04)	2m 2s
Android (ubuntu-24.04, aarch64-linux-android)	1m 58s
Test (macOS-latest)	2m 4s
Difftest (ubuntu-24.04)	1m 48s
Test (windows-2022)	1m 58s
Difftest (macOS-latest)	2m 2s
Compiletest (macOS-latest, vulkan1.1,vulkan1.2,vulkan1.3,vulkan1.4, false)	2m 1s
Compiletest (windows-2022, vulkan1.1,vulkan1.2,vulkan1.3,vulkan1.4, false)	1m 56s
Compiletest (ubuntu-24.04, vulkan1.1,vulkan1.2,vulkan1.3,vulkan1.4, false)	2m 2s
Compiletest (ubuntu-24.04, wgsl, true)	1m 58s
Difftest (windows-2022)	1m 51s
cargo-deny	55s
Lint	2m 2s
test_success	3s
	24m 40s

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