WebGPU: add memory aliasing for intermediate tensor buffers #4943

Job	Run time
test-xnnpack / test-backend-linux (xnnpack, operators) / linux-job	15m 3s
test-xnnpack / test-backend-linux (xnnpack, models) / linux-job	24m 4s
test-xnnpack / test-backend-macos	0s
test-xnnpack / package-golden-artifacts	3m 43s
	42m 50s

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