integration test for the sarusctl to validate concurrent containers

[fcruzcscs]

Implement an integration test for the sarusctl that validates concurrent container runs do not conflict when exited in a staggered pattern.

Bug reproduction:

• Launch 2 separate sarusctl containers concurrently, each running a long-lived workload (e.g., sleep)
• Wait for both containers to be up and running
• Terminate the first container normally
• Check that the second container continues running and completes its full run, rather than terminating unexpectedly from first instance shared resource conflict