chore(repo): untrack ChatTwo.Tests, matches upstream layout

Drop the test project from version control. Upstream Chat 2 also
keeps ChatTwo.Tests outside the public repo, and the test sources
need a Dalamud assembly bundle that only resolves on a configured
Windows dev box anyway. The files stay on disk for local runs but
no longer ship with the source.

.gitignore

@@ -374,6 +374,9 @@ FodyWeavers.xsd
 
 #Specs und Plan datein
 /.superpowers/
+
+#Test Datein
+ChatTwo.Tests
 TestResults
 *.db-shm
 *.db-wal