[ExecuTorch][WebGPU] Dynamic resize hooks for sigmoid and select_copy #9515

Job	Run time
test-arm / test-backend-linux (arm_vgf_fp, operators) / linux-job	17m 25s
test-arm / test-backend-linux (arm_tosa_fp, models) / linux-job	16m 18s
test-arm / test-backend-linux (arm_vgf_fp, models) / linux-job	16m 33s
test-arm / test-backend-linux (arm_tosa_fp, operators) / linux-job	15m 53s
test-arm / test-backend-macos	-1s
test-arm / package-golden-artifacts	45s
	1h 6m 53s

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