WebGPU op-test framework + mul op manual merge #1547

Job	Run time
test-webgpu / test-backend-linux (webgpu, operators) / linux-job	46m 29s
test-webgpu / test-backend-linux (webgpu, models) / linux-job	26m 22s
test-webgpu / test-backend-macos	-6s
test-webgpu / package-golden-artifacts	1m 40s
	1h 14m 25s

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