fixed override parameters undefined issue

[v-dko]

Task name: Update AzureResourceManagerTemplateDeploymentV3 to catch a case when metadata is missing for override parameters (https://dev.azure.com/mseng/AzureDevOps/_workitems/edit/2263340)

Description: added error for override parameters undefined issue

Risk Assesment(Low/Medium/High): Low

Added unit tests: (Y/N) N

Documentation changes required: (Y/N) N

Attached related issue: (Y/N) Y

Checklist:

• Task version was bumped - please check instruction how to do it
• Checked that applied changes work as expected

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[v-dko]

/azp run

[v-bkasu]

/azp run