add `spirv-unknown-naga-wgsl` target via naga #519

Job	Run time
Android (ubuntu-24.04, aarch64-linux-android)	9m 1s
Test (ubuntu-24.04)	9m 33s
Difftest (macOS-latest)	6m 44s
Difftest (ubuntu-24.04)	9m 54s
Difftest (windows-2022)	19m 30s
Test (windows-2022)	16m 57s
cargo-deny	52s
Test (macOS-latest)	11m 36s
Lint	6m 16s
Compiletest (ubuntu-24.04, vulkan1.1, false)	4m 36s
Compiletest (ubuntu-24.04, vulkan1.2, false)	4m 37s
Compiletest (ubuntu-24.04, vulkan1.4, false)	4m 34s
Compiletest (ubuntu-24.04, vulkan1.3, false)	4m 38s
Compiletest (windows-2022, vulkan1.4, false)	9m 37s
Compiletest (windows-2022, vulkan1.2, false)	8m 32s
Compiletest (windows-2022, vulkan1.1, false)	9m 41s
Compiletest (windows-2022, vulkan1.3, false)	9m 27s
Compiletest (macOS-latest, vulkan1.2, false)	3m 25s
Compiletest (macOS-latest, vulkan1.4, false)	4m 35s
Compiletest (macOS-latest, vulkan1.3, false)	5m 34s
Compiletest (ubuntu-24.04, wgsl, true)	4m 29s
Compiletest (macOS-latest, vulkan1.1, false)	3m 41s
test_success	2s
	2h 47m 51s

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