Azure istio auth file rename

All Submissions:

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• [YES/NO] I have added an explanation of what changes in this merge do and why we should include it?
• [YES/NO] I have updated the documentation accordingly.
• [YES/NO/NA] I have added tests to cover my changes.
• [YES/NO/NA] All new and existing tests passed.
• [YES/NO/NA] My code follows the code style of this project.
• [YES/NO/NA] I ran lint checks locally prior to submission.

What is the issue or story related to the change?

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Following the convention I noticed for auth files in Legal service.

High level design:

Issue:

Change details:

Test coverage:

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Does this introduce a breaking change?

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• [YES/NO]

Pending items

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Reviewer request

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• Please provide an ETA when you plan to review this MR. Write a comment to decline or provide an ETA.
• Block the MR if you feel there is less testing or no details in the MR
• Please cover the following aspects in the MR -- Coding design: <Reviewer1> -- Backward Compatibility: <Reviewer2> -- Feature Logic: <Logic design> -- <Any other context mention here> OR -- <Component 1>: <Reviewer1> -- <CosmosDB>: <Reviewer2> -- <ServiceBus> <Reviewer3> -- <Mention any other component and owner>

Other information

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