Add known-issue scenario for infinite loop

related: https://github.com/test-unit/test-unit//blob/ef36dc66348753391523be333163c8d5902036b3/lib/test/unit/fixture.rb#L21

Author: alpaca-tc

scenario/known-issues/avoid-infinite-loop-3.rb

@@ -0,0 +1,9 @@
+## update: test.rb
+module A
+  module A
+  end
+end
+
+module B
+  include A
+end