Need to migrate MultiNodeTests

[Aaronontheweb]

Version Information
Version of Akkatecture? current dev branch
Which Akkatecture Modules? https://github.com/AfterLutz/Akkatecture/tree/dev/test/Akkatecture.Tests.MultiNode

Describe the bug
Current implementation is using a hacky version of the old MNTR, whereas we ship native dotnet test support now: https://github.com/akkadotnet/Akka.MultiNodeTestRunner

Expected behavior
Should be able to run dotnet test on the entire solution, per what I did here: #12

Actual behavior
dotnet test barfs and dies because it depends on a custom entry point being executed.

Environment
Github Actions windows-latest and ubuntu-latest