example-get-started: codify the branch with CML report and larger dataset

[shcheklein]

As we use now project as a demo for studio, we added the new branch and PR:

https://github.com/iterative/example-get-started/pull/8

• we need to add commands to the script to generate this branch
• we need to add commands to generate this PR
• make sure that we drop the previous one
• make sure that CML reports are being generated