Cosmos: consolidate auth header create/update to one method

[milismsft]

Is your feature request related to a problem? Please describe.
Consolidate all the auth refresh handling to one method, i.e. populateAuthorizationHeader()

Describe the solution you'd like
Currently auth header is updated/refreshed in several places making it more difficult to maintain.

Describe alternatives you've considered
na

Additional context
na

Information Checklist
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• Expected solution specified

[ghost]

Thanks for the feedback! We are routing this to the appropriate team for follow-up. cc @wmengmsft, @MehaKaushik, @shurd, @anfeldma-ms

[kushagraThapar]

@aayush3011 - pls take a look at this when you get chance, thanks!

[github-actions]

Hi @milismsft, we deeply appreciate your input into this project. Regrettably, this issue has remained inactive for over 2 years, leading us to the decision to close it. We've implemented this policy to maintain the relevance of our issue queue and facilitate easier navigation for new contributors. If you still believe this topic requires attention, please feel free to create a new issue, referencing this one. Thank you for your understanding and ongoing support.