feat: ksbp-58641 extend k8s deployer with component dependencies

[travis-kindred]

Extend PIT configuration file with component dependencies

• Feature justification
  With more dependent components required to be up-and-running before starting the DPT tests, the current naive sequential deployment and un-deployment ordering is limited to handle complex dependencies. Thus, the toolkit needs to be extended.

• Feature descriptions
  Optional dependsOn field on each component and is respected by the deployer when set.

  • During deployment, the current component is deployed after all dependent components are ready.
  • During un-deployment, the current component is un-deployed before all dependent components.
  • When multiple components are on the same topological level, the original order of component definition in the PIT yaml file is preserved. (i.e. the components are deployed and un-deployed in the order defined in the PIT yaml file).

• Backward compatibility
  This extension is backward compatible and doesn't introduce breaking changes.

  • The dependsOn field is optional, indicating no dependencies if the field is not present.
  • When the dependsOn field is not present in any of the components, all components are considered at the same topological level. In this case, the deployment and un-deployment order follows the component definition order in the PIT yaml file, which is consistent with previous behaviour.

  Therefore, this extension doesn't break existing PIT configs.

• Thorough unit tests
  All newly introduced behaviours and backward compatibility have been covered by unit tests.