Delete points during Setup #79
Description
We want to allow users to delete points when they notice problems in the preview. Often times empty or bad data shows up as its own cluster in the UMAP and its a great time to just get rid of it. Since it often creates a tight cluster it often interferes with good clustering.
Supporting deletion could be done by creating a dataset level deleted.indices file that is checked by each step in the process.
Each step would ignore the deleted indices as input to its processing (whether its umap not considering the embeddings, clustering not considering the umap points etc).
finally, the deleted.indices would also update the scopes "deleted" column which is currently supporting deleting points in the explore page.