* Fixes to get solution building in VS with net7 changes.
* More fixes + some code review.
* CONTRIBUTING update.
* Attempting to fix integration tests.
* Attempting to fix integration tests.
* Attempt to fix integration tests.
* Attempt to fix integration tests.
* Remove AspNetCore 3.1 test app
* Remove netcoreapp3.1 target from projects
* Bump to DiagnosticSource 7.0.0-preview.4.22229.4
* Enable CI on net7.0 branch
* Remove trailing space