After #2223 dpt.repeat() started raising an error when repeats is as 1D usm_ndarray

import dpctl.tensor as dpt

a = dpt.arange(8)
dpt.repeat(a, ind)

# repeats = int(repeats)
# TypeError: only 0-dimensional arrays can be converted to Python scalars

Previously this worked because int(repeats) was implicitly allowed for 1D usm_ndarrays

This PR updates dpt.repeat() to explicitly extract the single element from size-1 1D usm_ndarray repeats before converting it to a Python scalar and extends tests to cover both 0D and 1D repeats cases

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