changed two AOAI alerts to visible with the proper thresholds

[cassiekays]

Overview/Summary

Replace this with a brief description of what this Pull Request fixes, changes, etc.

This PR fixes/adds/changes/removes

1. added threshold and severity for both AzureOpenAITimeToResponse and AzureOpenAIProvisionedManagedUtilizationV2
2. Replace me
3. Replace me

Breaking Changes

1. Replace me
2. Replace me

As part of this Pull Request I have

• Read the Contribution Guide and ensured this PR is compliant with the guide
• Checked for duplicate Pull Requests
• Associated it with relevant GitHub Issues or ADO Work Items (Internal Only)
• Ensured my code/branch is up-to-date with the latest changes in the main branch
• Ensured PR tests are passing
• Updated relevant and associated documentation (e.g. Contribution Guide, Docs etc.)

[JoeyBarnes]

@cassiekays - since these were verified by the PG, let's change the verified flag to true