NGINXaaS: Add display name to metrics catalog

[arpith-f5]

Proposed changes

Write a clear and concise description that helps reviewers understand the purpose and impact of your changes. Use the
following format:

Problem: Platform metrics are queried using Display Names in Azure Monitor. Add Display Names to metrics catalog for easy lookup
Solution: Add a new column for Display Name

Testing: local testing

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specific feedback, add them here.

If this PR addresses an issue on GitHub, ensure that you link to it here:

Closes #ISSUE

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[arpith-f5]

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