Upload artifacts to an existing machine learning model version

1. Base support Merge request feature: Upload artifacts to an existing machin... (!152163 - merged)
2. Add support for progress bar and percentage
3. Add multiple file uploads sequentially
4. Add multiple file uploads simultaneously feature: Simultaneous multiple artifact upload ... (#461750 - closed)

Context

The current way to upload artifacts are through the MLflow python client.

Assumed problem

We should add an artifact uploader for existing models using UI per the design in [UI] Create a model (#387580 - closed)

Proposal

We should create an "Upload" button and model and use the file uploader in the below design from [UI] Create a model (#387580 - closed)

Users can upload more artifacts into the same model version later