Throw TUnit's AssertionException instead of XunitException

Proprietary

Replace new XunitException(message) from Xunit.Sdk with TUnit's new AssertionException(message).

OpenRewrite.Recipes.CSharp.Migration.TUnit.FromXUnit.XUnitExceptionToAssertionException
mod run . --recipe=OpenRewrite.Recipes.CSharp.Migration.TUnit.FromXUnit.XUnitExceptionToAssertionException

Install it once, then run it on every repository under the current directory. New to the Moderne CLI? Set it up.