feat(jobs): improve MLOps example

[redanrd]

Summary

Improve MLOps example:

• Make MLOps pipeline automatic after first deployment using CRON schedules to: fetch data from source then train model regularly, and deploy the latest model version from model registry. The schema is useful when the data provided by source grows, which would in general improve inference server performance.

• Code formatting.

Checklist

• [x] I have reviewed this myself.
• [ ] I have attached a README to my example. You can use this template as reference.
• [ ] I have updated the project README to link my example.