Adding Audience to Istio config to have app id check

[kiranveerapaneni]

All Submissions:

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• [YES] Have you added an explanation of what your changes do and why you'd like us to include them?
• [YES I have updated the documentation accordingly.
• [NA] I have added tests to cover my changes.
• [NA] All new and existing tests passed.
• [NA] I have formatted the terraform code. (terraform fmt -recursive && go fmt ./...)

Current Behavior or Linked Issues

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Currently there are no audience check in Istio, So adding this change to have the audience check similar to AAD filter.

Does this introduce a breaking change?

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• [NO]

Other information

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[polavishnu4444]

Not touching any .tf files for the infra changes. Its only the yml files, merging the PR.