Secret rotation and monitoring strategy

We have dozens of service principal credentials stored in the live test provisioning keyvault. We need to have a better way of managing these credentials, especially the ability to rotate them with minimal toil. This could mean simple rotation automation, or some higher level solution to make test credentials more dynamic.

Start by reviewing the live test provisioning Key Vault and the service principal credentials it stores. Define the required rotation and monitoring behavior, then confirm that the resulting strategy reduces manual credential-management toil and supports more dynamic test credentials.

Written by the indexing model from the issue text.