PY-22042 Gutter icon for running main clause

python/testData/codeInsight/runLineMarker/not_runnable.py

@@ -0,0 +1,10 @@
+def f():
+    def g():
+        pass
+
+    if __name__ == '__main__':
+        g()
+    print(1)
+
+
+f()

python/testData/codeInsight/runLineMarker/runnable.py

@@ -0,0 +1,5 @@
+def f():
+    print(1)
+
+if __name__ == "__main__":
+    f()