Remove the no longer needed separate SpectrometerExtrapolator
As discussed in !22798 (merged):
MaterialAllocator doesn't need a separate SpectrometerExtrapolator anymore, its usage is now handled by the class's other extrapolator.
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As discussed in !22798 (merged):
MaterialAllocator doesn't need a separate SpectrometerExtrapolator anymore, its usage is now handled by the class's other extrapolator.