Fix keyvault access policy config key and landingzone level

[heidecke]

64

PR Checklist

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• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.
• My code follows the code style of this project.
• I ran lint checks locally prior to submission.
• Have you checked to ensure there aren't other open Pull Requests for the same update/change?

Description

The keyvault_access_policies_azuread_apps currently references the incorrect config key and the azure_devops template is configured at the incorrect level.

Does this introduce a breaking change

• YES
• NO

Testing

Running terraform plan should now produce no errors and the apply should now run without error.