Statistical kernels are not supported on integrated graphics

[AlexanderKalistratov]

Integrated graphics doesn't support double data type.

cov supports only double input and output: https://github.com/IntelPython/dpnp/blob/cfc9b40f97d5cbc3114171728bf96e6f59b74005/dpnp/backend/kernels/dpnp_krnl_statistics.cpp#L1380

max, min, mean, median, var and std supports only double output for integer input: https://github.com/IntelPython/dpnp/blob/cfc9b40f97d5cbc3114171728bf96e6f59b74005/dpnp/backend/kernels/dpnp_krnl_statistics.cpp#L1400