[New GitHub Action Job] Automatically create/update tiny models
# What does this PR do?

[New GitHub Action Job] Automatically create/update tiny models

## Goal

**A scheduled job that create/update tiny models periodically**
  - so **we will have tiny versions for newly added models in `transformers` as soon as possible**

### Some properties
  - For a new model type: The Hub repo. is created
  - For a new framework implementation of an existing model type: A Hub repo. PR is opened
  - We keep track of the commit hash information for tiny models on the Hub
    - The pipeline tests will use the commit hash information stored in `tiny_model_summary.json` file
      - To avoid sudden CI failures due to new commits
    - The CI job will produce a file `updated_tiny_model_summary.json`
      - We should open a PR in `transformers` to update `tiny_model_summary.json`
        - If all pipeline tests pass, we are good to merge and use the new/updated tiny models on the Hub.  
_The documentation is not available anymore as the PR was closed or merged._<|||||>Just a minor update, including the revision number. Will merge once the CI being green. Thank you for the reviews 🚀 