add `spirv-unknown-naga-wgsl` target via naga #794

Job	Run time
Android (ubuntu-24.04, aarch64-linux-android)	8m 32s
cargo-deny	54s
Test (ubuntu-24.04)	9m 3s
Test (macOS-latest)	8m 30s
Difftest (windows-2022)	34m 40s
Difftest (ubuntu-24.04)	15m 38s
Test (windows-2022)	15m 56s
Compiletest (ubuntu-24.04, vulkan1.1,vulkan1.2,vulkan1.3,vulkan1.4, false)	6m 17s
Lint	5m 56s
Difftest (macOS-latest)	16m 56s
Compiletest (ubuntu-24.04, naga-wgsl, true)	4m 24s
Compiletest (windows-2022, vulkan1.1,vulkan1.2,vulkan1.3,vulkan1.4, false)	12m 55s
Compiletest (macOS-latest, vulkan1.1,vulkan1.2,vulkan1.3,vulkan1.4, false)	5m 49s
test_success	2s
	2h 25m 32s

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