Add Preflight Image to Renovate Configuration

The preflight check command deploys a container into the cluster and runs some commands to validate system parameters and resources. Currently, it is using ubi8-minimal. We need to update the image to use the latest ubi9-minimal available in Iron Bank and test that it still works as expected.

Task:

• Update the preflight check default image reference to ubi9-minimal and test -> !78 (diffs)
• Update renovate.json to scan the default image reference for updated IB version
• Update the Helm chart to show which image is now being used -> https://repo1.dso.mil/big-bang/product/packages/bbctl/-/blob/main/chart/Chart.yaml?ref_type=heads#L52