Census S3 H5AD bucket now is limited to data present in Census
Beginning with the 2024-01-29 Census weekly build, the Census build will only include H5AD files contributing data to companion SOMA objects. Previously, Census builds included all H5ADs in the CELLxGENE corpus. Put another way, if a dataset fails to contribute a cell to the Census, the dataset H5AD will not be present in the Census build h5ad directory.