PY-16412 Detect presence of type annotations for variables purely syntactically

Namely, if there is any PEP 526 variable type annotation or a comment
that starts with "# type:", don't suggest the intention regardless
of whether the type hint itself is well-formed, properly resolved, etc.

python/testSrc/com/jetbrains/python/intentions/PyAnnotateVariableTypeIntentionTest.java

@@ -38,6 +38,18 @@ public class PyAnnotateVariableTypeIntentionTest extends PyIntentionTestCase {
     doNegativeTest();
   }
 
+  public void testNotSuggestedForLocalAssignmentTargetWithUnresolvedAnnotation() {
+    doNegativeTest();
+  }
+
+  public void testNotSuggestedForLocalAssignmentTargetWithUnresolvedTypeComment() {
+    doNegativeTest();
+  }
+
+  public void testNotSuggestedForLocalAssignmentTargetWithUnresolvedAheadOfTimeAnnotation() {
+    doNegativeTest();
+  }
+
   public void testAnnotationLocalSimpleAssignmentTarget() {
     doTestAnnotation();
   }