Fix EOL images and keyvault RBAC authorization

[Chakradhar886]

• Replace openmpi4.1.0-ubuntu20.04 with openmpi4.1.0-ubuntu22.04 in safe-rollout and simple-deployment notebooks (EolImageBrownouts)
• Add enable_rbac_authorization=False to keyvault notebook (Azure changed default to RBAC, causing access policies to be ignored and container to crash with 502)
• Increase random range for keyvault name to avoid collisions

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