Currently packaging tests failed for few reasons:
1. We started using <langVersion>9</langVersion> attribute in our code, but dotnet creates test applications with version 7.3 by default. To fix it we need specifying version 9 during creating application
2. .net 6 started using implicit global using by default that is not supported for TFs that we currently support. Locally if your system uses .net 6 by default, you need explicitly disable this feature. See for details: https://dotnetcoretutorials.com/2021/08/31/implicit-using-statements-in-net-6/