Adds a fallback mechanism to AAD scope override. #3219
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As part of the current PR:
If end-user provided a custom scope by overriding the environment variable() then we use that value for AAD authentication. In case of failures with the custom scope there is no retry/fallback.
If no custom scope is provided then we use account scope for AAD authentication. In case of failure with exception AADSTS500011, there is fallback implemented as part of this PR and then it retries with this scope "https://cosmos.azure.com/.default".
This is a temporary change we are implementing till this "https://cosmos.azure.com/.default" is accepted as the scope across all environments and clouds.