Feedback ticket for upgrade assistant experience when upgrading Azure Function project

[abpiskunov]

Original ticket was opened by a user through Visual Studio feedback website and here is a related bug with all info: https://devdiv.visualstudio.com/DevDiv/_workitems/edit/2053069.

Upgrade Assistant got an initial upgrade capability for Azure Functions projects to latest versions and to start with it assumed best suggested function types to upgrade to. However user is having issues with that "function apps from in-process execution model to isolated process execution model".

It is recommended to double check the upgrade targets and see if some settings could be offered to the user to keep function type as it was or do change it. Also, there were some code transformations, however there probably a lot more code changes that could be automated according to his 55 build errors after upgrade. 100% transformation is probably never achievable, however it would be nice to keep adding most common code transformations over time.