ResourceScatterUpdate: Gracefully handle inconsistent indices and updates in

the kernel.

With graph execution, consistency between the shapes of the arguments to
ResourceScatterUpdate is validated by the shape inference functions at graph
construction time.

With eager execution, the shape inference logic isn't executed, so inconsistent
arguments could be provided to the kernel, which would result in a segmentation
fault prior to this change. As demonstrated by the added tests.

PiperOrigin-RevId: 188729154