azcore: idempotent operations that return an io.ReadCloser should have reliable reading

[jhendrixMSFT]

Right now we simply expose the io.ReadCloser from the HTTP response body. If reading transiently fails, there is no retry. We should wrap the response in a retriable reader if the operation is idempotent. We can still expose it as an io.ReadCloser.

This requires codegen changes and possible supporting machinery in azcore.

[github-actions]

Hi @jhendrixMSFT, we deeply appreciate your input into this project. Regrettably, this issue has remained unresolved for over 2 years and inactive for 30 days, 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.