Pylint warnings in azure-communication-messages

[cemateia]

Analyze stage fails in python-pullrequest pipeline because of multiple warnings, including in the messages sdk:

https://dev.azure.com/azure-sdk/public/_build/results?buildId=4988938&view=logs&jobId=b70e5e73-bbb6-5567-0939-8415943fadb9&j=b70e5e73-bbb6-5567-0939-8415943fadb9&t=5da75d26-b661-5189-46a3-f9dd247b5d85

[github-actions]

Thanks for the feedback! We are routing this to the appropriate team for follow-up. cc @Shamkh.