* WIP - Create default experiment upon API server initialization
* Default experiment initialization caused crashes if API server pod was restarted without clearing DB
* Adding new table to store default experiment ID
* Add default experiment type model definition
* Minor fixes, everything seems to work now
* Clean up. Renamed to default_experiment_store
* Adds tests for the default_experiment_store
* Add integration test for verifying initial cluster state. Currently only covers existence of default experiment
* Don't run initialization tests except as integration tests
* Fixes comments
* PR comments and cleanup
* Extract code in resource_manager to helper func
Riley Bauer