Draft: Switch to CNG OpenBao image

What does this MR do?

Switch to CNG OpenBao image

• Switch to CNG OpenBao image introduced in gitlab-org/build/CNG!2659.
• Introduce e2e tests using FIPS and UBI OpenBao image.
• Support image suffix from the global value defined by GitLab chart.

Closes https://gitlab.com/gitlab-org/cloud-native/charts/openbao/-/issues/30

Changelog: changed

Author's Checklist

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Required

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Expected

• Test plan indicating conditions for success has been posted and passes.
• Documentation is created or updated.
• Tests are added.

Related issues