Explicitly add PixelReadoutManagerCfg in NnClusterizationFactory and InDetTestPixelLayerTool configs
The NnClusterizationFactory expects the PixelReadoutManager as input https://gitlab.cern.ch/atlas/athena/-/blob/main/InnerDetector/InDetRecTools/SiClusterizationTool/SiClusterizationTool/NnClusterizationFactory.h#L241 so explicitly adding it.
Also added to the InDetTestPixelLayerTool config https://gitlab.cern.ch/atlas/athena/-/blob/main/InnerDetector/InDetRecTools/InDetTestPixelLayer/src/InDetTestPixelLayerTool.cxx#L72
Relevant for some standalone workflows, such as alignement.