_load_remote_dataset: Rename the parameter names 'dataset_name'/'dataset_prefix' to 'name'/'prefix'

[seisman]

In the _load_remote_dataset function, we have parameters dataset_name and dataset_prefix. I propose to

• Rename dataset_name to name
• Rename dataset_prefix to prefix
• Remove the trailing _ from dataset_prefix, e.g., dataset_prefix="earth_relief_" should be prefix="earth_relief".

Originally posted by @seisman in #3120 (comment)

[seisman]

Need to wait for #3120 and #3048.