Fix Recovery Services Vault MI Issue

[MariusStorhaug]

Change

-> Though this could be lying! :D

Added extra condition on systemAssignedPrincipalId to check if there is principal ID in the identity property of the deployed resource. Currently it seems flaky from the API if this is returned or not. So seems like a backend issue.

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update (Wiki)

Checklist

• I'm sure there are no other open Pull Requests for the same update/change
• My corresponding pipelines / checks run clean and green without any errors or warnings
• My code follows the style guidelines of this project
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation (readme)
• I did format my code