Register assets from UI asks for name but not description

Should the MLX UI allow to enter a description for assets to be registered?

Currently only a name is required to be entered. Without a description the asset card on the featured assets page looks very empty.

Alternatively, the API can extract the description from the uploaded YAML, if available. This was done for pipelines in PR #156.

Screenshot of existing upload dialog, i.e. for registering a new Dataset (the dialog looks the same for any asset type)

Just like the text box for `Dataset Name` that allows to override the `name` from inside the YAML, we need to duplicate that into another text box `Dataset Description` to override the description from inside the YAML

@animeshsingh @Tomcli @drewbutlerbb4