Warn users about correct model type string for hf uploads

[probicheaux]

Description

Raise runtime error if the model type isnt supported by roboflow-model-conversion

Type of change

Please delete options that are not relevant.

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] This change requires a documentation update

How has this change been tested, please provide a testcase or example of how you tested the change?

Locally

Any specific deployment considerations

For example, documentation changes, usability, usage/costs, secrets, etc.

Docs

• [ ] Docs updated? What were the changes:

[iurisilvio]

@probicheaux is this PR ready?

[probicheaux]

@iurisilvio ya