WebGPU op-test framework + mul op manual merge #8625

Job	Run time
test-xnnpack / test-backend-linux (xnnpack, operators) / linux-job	14m 53s
test-xnnpack / test-backend-linux (xnnpack, models) / linux-job	20m 58s
test-xnnpack / test-backend-macos	0s
test-xnnpack / package-golden-artifacts	3m 43s
	39m 34s

Provide feedback