[Chore] Fix assert for multi-cluster test

[IshwarKanse]

Description:
For the multi-cluster test, the Kubernetes job completion status has changed in OCP 4.18

status:
  completionTime: "2024-11-21T05:35:45Z"
  conditions:
  - lastProbeTime: "2024-11-21T05:35:45Z"
    lastTransitionTime: "2024-11-21T05:35:45Z"
    message: Reached expected number of succeeded pods
    reason: CompletionsReached
    status: "True"
    type: SuccessCriteriaMet
  - lastProbeTime: "2024-11-21T05:35:45Z"
    lastTransitionTime: "2024-11-21T05:35:45Z"
    message: Reached expected number of succeeded pods
    reason: CompletionsReached
    status: "True"
    type: Complete
  ready: 0
  startTime: "2024-11-21T05:35:41Z"
  succeeded: 1
  terminating: 0
  uncountedTerminatedPods: {} 

This condition is not available anymore:

status:
  conditions:
    - status: "True"
      type: Complete 

The PR updates the test to use an assert which works both with OCP 4.18 and older OCP versions.