Fix state prep operation decomposition with `LightningQubit` #3954

Job	Run time
vcpkg dependencies (windows-latest)	41s
Set builder matrix	7s
Kokkos core (SERIAL)	7s
C++ tests (Windows) (windows-latest, lightning_qubit)	11m 35s
C++ tests (Windows, Kokkos) (windows-latest, lightning_kokkos, SERIAL, 4.2.00)	6m 27s
Upload coverage data to codecov	9s
	19m 6s

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