[flow][tests] Repro for broken get-def for esm module ref

Summary:
It has never really worked 100% of the time, because get-def for module ref depends on reasons, and the reason of namespaced export points to module ref itself.

Recent change of `module.system.haste.module_ref_prefix.standard_cjs_esm_interop` under `experimental.module.automatic_require_default=true` has pushed the case of esm module with default export into the non-working case.

This diff first documents the behavior that it's not working for esm modules with default exports without `experimental.module.automatic_require_default=true`, with fixes coming later in the stack.

Changelog: [internal]

Reviewed By: panagosg7

Differential Revision:
D67869373

------------------------------------------------------------------------
(from 4791ddced87b1518a3251b67f999fdccd16c8799)

fbshipit-source-id: 626da3c3a63b2a392f778937123df4bf3df1fbd3

tests/get_def2/ParentESM.js

@@ -0,0 +1,4 @@
+// @flow
+
+const ParentFoo = {foo: 'bar'};
+export default {ParentFoo}

tests/get_def2/get_def2.exp

@@ -138,6 +138,10 @@ module_ref.js:3:4
 Flags:
 Parent.js:4:18,4:28
 
+module_ref.js:5:4
+Flags:
+module_ref.js:5:1,5:15
+
 refinements.js:10:4
 Flags:
 refinements.js:4:7,4:9

tests/get_def2/module_ref.js

@@ -2,3 +2,5 @@
 
 'm#./Parent';
 // ^
+'m#./ParentESM';
+// ^