Support for submitting new job to the job scheduler engine

[kpouget]

In the second/bottom workflow (the inference workflow), the test orchestration of Project C is able to submit sub-jobs inside the management cluster.

The test orchestration either submits sub-jobs to the job scheduler engine. Or it creates the Pods itself, for instance with Pipelines (that's what is drawn).
Either way:

• the main job doesn't request any hardware.
• the sub-jobs request the specific hardware slice they need for their testing (eg, in terms of GPU spec)