fixed PY-7971 Insert type assertion: produces invalid assertion in case of caret at the second reference in expression

python/testData/intentions/afterTypeAssertion4.py

@@ -0,0 +1,4 @@
+def foo3(x, y):
+  assert isinstance(y, object)
+  i = x + y
+  return i

python/testData/intentions/beforeTypeAssertion4.py

@@ -0,0 +1,3 @@
+def foo3(x, y):
+  i = x + <caret>y
+  return i