[jobs-api] use pydantic for all models
requested to merge use_pydantic_for_core_job_model into move_most_custom_validations_out_of_api_models
- use pydantic for quota models
- use pydantic for health_check models
- use pydantic for CronExpression models
- use pydantic for Job model
- fix tests
Depends-on: jobs-cli!96
Depends-on: jobs-cli!97
Depends-on: !150
Bug: T389118
Signed-off-by: raymond-ndibe rndibe@wikimedia.org
Edited by David Caro