Upgrade xplat/executorch to Python Scientific Stack 3 (#18692) #1571

Job	Run time
test-arm / test-backend-linux (arm_vgf_fp, models) / linux-job	26m 37s
test-arm / test-backend-linux (arm_vgf_fp, operators) / linux-job	17m 31s
test-arm / test-backend-linux (arm_tosa_fp, models) / linux-job	26m 9s
test-arm / test-backend-linux (arm_tosa_fp, operators) / linux-job	19m 0s
test-arm / test-backend-macos	0s
test-arm / package-golden-artifacts	43s
	1h 30m 0s

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