sync flow parser tests

Summary:
```
cp -r ~/fbsource/fbcode/flow/src/parser/test/flow/* ~/fbsource/xplat/hermes/external/flowtest/test/flow
```

Reviewed By: SamChou19815

Differential Revision: D67046460

fbshipit-source-id: 1393149070b25e3d635d50c906fb352d93cfe64c

Author: panagosg7

external/flowtest/README.md

@@ -1 +1 @@
-Flow git commit: a8f803e3d243c0f8a738f7ebd0ef534a6a5561fd7482f14cf4e96afa879ac3316a70bce06c432ccf
+Flow git commit: facff9ab9e7de99ddc93ce13b5f33518f7766a53

external/flowtest/test/flow/ES6/modules/migrated_0023.tree.json

@@ -94,6 +94,7 @@
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external/flowtest/test/flow/ES6/modules/migrated_0024.tree.json

@@ -18,7 +18,6 @@
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@@ -30,11 +29,13 @@
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         "decorators":[]

external/flowtest/test/flow/arrow_function/migrated_0006.tree.json

@@ -82,6 +82,7 @@
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               "bound":null,
+              "const":false,
               "variance":null,
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external/flowtest/test/flow/async_arrow_functions/with_type_parameters.tree.json

@@ -140,6 +140,7 @@
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                   "name":"T",
                   "bound":null,
+                  "const":false,
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@@ -149,6 +150,7 @@
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@@ -158,6 +160,7 @@
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+                  "const":false,
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external/flowtest/test/flow/async_await/async_generic_method.tree.json

@@ -52,6 +52,7 @@
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+                    "const":false,
                     "variance":null,
                     "default":null
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external/flowtest/test/flow/async_generators/migrated_0001.tree.json

@@ -65,6 +65,7 @@
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             "bound":null,
+            "const":false,
             "variance":null,
             "default":null
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external/flowtest/test/flow/async_generators/migrated_0003.tree.json

@@ -87,6 +87,7 @@
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                     "bound":null,
+                    "const":false,
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external/flowtest/test/flow/async_generators/migrated_0005.tree.json

@@ -87,6 +87,7 @@
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+                    "const":false,
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external/flowtest/test/flow/async_generators/migrated_0007.tree.json

@@ -75,6 +75,7 @@
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+                  "const":false,
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