Job cluster support and pytest update

[htuomola]

• Add new command line option new_cluster_config which allows passing job cluster config in a json string
• Update pytest to latest (works fine) and fix Test- prefix classes causing errors in test discovery

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[htuomola]

@microsoft-github-policy-service agree

[arturo-opsetmoen-amador]

Is there any way to complete this pull request? @microsoftopensource