Don't add a tag on the Hub on release
_The documentation is not available anymore as the PR was closed or merged._
Datasets with no namespace on the Hub have tags to redirect to the version of datasets where they come from.
I’m about to remove them all because I think it looks bad/unexpected in the UI and it’s not actually useful

Therefore I'm also disabling tagging.

Note that the CI job will be completely removed in https://github.com/huggingface/datasets/pull/4974 anyway