Fix private property parsing in Flow (#8340)

* Fix private property parsing in Flow

* Flow tests updated

* Fix type error

* Appropriate name was given to test folder

* Fix

* Empty

* Correct type annotation

* Add required changes in generator package

* Add required changes in flow-strip-types

scripts/tests/flow/flow_tests_whitelist.txt

@@ -15,6 +15,7 @@ async_await/migrated_0020.js
 async_await/migrated_0024.js
 async_await/migrated_0027.js
 async_generators/migrated_0007.js
+catch/optional_catch_binding.js
 class_properties/migrated_0000.js
 class_properties/migrated_0005.js
 class_properties/migrated_0011.js
@@ -23,7 +24,8 @@ class_properties/migrated_0021.js
 class_properties/migrated_0026.js
 decorators/migrated_0003.js
 decorators/migrated_0007.js
-private_class_properties/valid.js
+private_class_properties/multiple.js
+private_class_properties/super.js
 types/annotations/migrated_0001.js
 types/annotations_in_comments_invalid/migrated_0003.js
 types/annotations/void_is_reserved_param.js

scripts/tests/flow/run_babel_parser_flow_tests.js

@@ -115,6 +115,7 @@ const options = {
     "flowComments",
     "jsx",
     "objectRestSpread",
+    "classPrivateProperties",
   ],
   sourceType: "module",
   ranges: true,