[Bugfix] Add MPS float64->float32 downcast (#3548) #8561

Job	Run time
tests-optdeps (3.12, 13.0) / linux-job	59m 20s
tests-gpu (3.12, 13.0, 1) / linux-job	12m 45s
tests-stable-gpu (3.12, 13.0, 3) / linux-job	11m 47s
tests-gpu-distributed (3.12, 13.0) / linux-job	29m 23s
tests-olddeps (3.10, 11.8) / linux-job	1h 0m 0s
tests-stable-gpu (3.12, 13.0, 1) / linux-job	12m 46s
tests-gpu (3.12, 13.0, 3) / linux-job	11m 39s
tests-gpu (3.12, 13.0, 2) / linux-job	16m 34s
tests-cpu (3.12) / linux-job	54m 41s
tests-cpu (3.13) / linux-job	50m 28s
tests-cpu (3.11) / linux-job	52m 2s
tests-stable-gpu (3.12, 13.0, 2) / linux-job	16m 54s
tests-stable-gpu-distributed (3.12, 13.0) / linux-job	29m 33s
tests-cpu (3.10) / linux-job	52m 54s
tests-cpu (3.14) / linux-job	35m 39s
test-setup-minimal (3.10) / linux-job	5m 45s
test-setup-minimal (3.14) / linux-job	5m 36s
upload-codecov	9s
	8h 37m 55s

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