Actually parse .js.flow files with hermes-parser (facebook#38774)

Summary:
Pull Request resolved: facebook#38774

Changelog: [Internal]

Reviewed By: cortinico

Differential Revision: D48047348

fbshipit-source-id: a2627766ffd73ff702880b8533f0051bcda22414

.eslintrc.js

@@ -24,7 +24,7 @@ module.exports = {
     // overriding the JS config from @react-native/eslint-config to ensure
     // that we use hermes-eslint for all js files
     {
-      files: ['*.js', '.js.flow'],
+      files: ['*.js', '*.js.flow'],
       parser: 'hermes-eslint',
       rules: {
         // These rules are not required with hermes-eslint