Move Azure Keyvault to Service Principal Auth

[halspang]

Description

The certificate for the keyvault expired so I moved it to Service Principal based auth since that's the recommended path anyway.

Signed-off-by: Hal Spang halspang@microsoft.com

Issue reference

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Please reference the issue this PR will close: NA

Checklist

Please make sure you've completed the relevant tasks for this PR, out of the following list:

• [ ] Code compiles correctly
• [ ] Created/updated tests
• [ ] Extended the documentation