Investigate and split maistra istio integ jobs in OpenShift CI

This is a follow up story to improve the existing maistra/istio integration test job in OpenShift CI. The current test job test maistra-istio-integ-aws-2-3 includes multiple test steps and run them sequentially.
Need to investigate if we can split them and run multiple test jobs as we did in maistra prow.

Acceptance:
1. Split the follow workflow steps into multiple test jobs:
https://github.com/openshift/release/blob/master/ci-operator/config/maistra/istio/maistra-istio-maistra-2.3.yaml#L98-L123
Each new test job will use the workflow and claim a cluster to run tests in a privilege pod.

2. Implement the same change for maistra 2.4 branch integ job.