Reinforcement Learning and Robotics are not task categories in HF datasets metadata
### Describe the bug

In https://huggingface.co/models there are task categories for RL and robotics but none in https://huggingface.co/datasets

Our lab is currently moving our datasets over to hugging face and would like to be able to add those 2 tags

Moreover we see some older datasets that do have that tag, but we can't seem to add it ourselves.

### Steps to reproduce the bug

1. Create a new dataset on Hugging face
2. Try to type reinforcemement-learning or robotics into the tasks categories, it does not allow you to commit

### Expected behavior

Expected to be able to add RL and robotics as task categories as some previous datasets have these tags

### Environment info

N/A