[jobs-api] save business models in a DB

Changes:

• storage/k8s
• runtimes/k8s
  • refactor runtime methods (renames, refactors, new methods)
  • remove all methods for getting the jobs from the runtime (we no longer need these since jobs will be saved in custom resources)
  • refactor all methods that fetch job status
  • move cron.py to runtime/k8s
  • other tjf/runtime/k8s refactors
• tjf/api
  • move file resolution and cron parsing all the way to the runtime from the models. We no longer need these here.
  • refactor jobs.py and api.py to make use of the all the changes
  • other tjf/api refactors
• tests
  • added new tests and modified other affected tests
  • other test refactors

Depends-On: !91
Depends-On: toolforge-weld!75 (merged)
Bug: T359650
Signed-off-by: raymond-ndibe rndibe@wikimedia.org