Update tutorials that use concat-based conditioning

[marksgraham]

Now that concat-based conditioning is supported in the infereres we should update tutorials to use the new infererers. AFAIK it is these two tutorials:

https://github.com/Project-MONAI/GenerativeModels/blob/main/tutorials/generative/2d_super_resolution/2d_stable_diffusion_v2_super_resolution.ipynb

https://github.com/Project-MONAI/GenerativeModels/blob/main/tutorials/generative/image_to_image_translation/tutorial_segmentation_with_ddpm.ipynb