Don't resolve forward outgoing references in class except cython and pyi (PY-26368)

python/testData/inspections/PyUnresolvedReferencesInspection/forwardReferencesInClassBody.py

@@ -0,0 +1,22 @@
+class A1:
+    foo = <error descr="Unresolved reference 'B1'">B1</error>()
+
+class B1:
+    pass
+
+
+class A21:
+    class A22:
+        bar = <error descr="Unresolved reference 'B2'">B2</error>()
+
+class B2:
+    pass
+
+
+class A31:
+    def baz(self):
+        class A32:
+            egg = B3()
+
+class B3:
+    pass