Move remaining Fantom files to react-native-fantom (#48143)

Summary:
Pull Request resolved: #48143

Changelog: [internal]

Just a small cleanup to move `jest/integration/*` to `packages/react-native-fantom`, so everything related to Fantom (config, runner, runtime, etc.) is in the same directory.

Reviewed By: javache

Differential Revision: D66874763

fbshipit-source-id: 8b87d7320c7704f7ce6cd58761508193784f5ce2

Author: rubennorte

.gitignore

@@ -157,4 +157,4 @@ vendor/
 .circleci/generated_config.yml
 
 # Jest Integration
-/jest/integration/build/
+/packages/react-native-fantom/build/

jest/integration/config/hasteImpl.js renamed to packages/react-native-fantom/config/hasteImpl.js

@@ -17,14 +17,13 @@ module.exports = {
   roots: [
     '<rootDir>/packages/react-native',
     '<rootDir>/packages/react-native-fantom',
-    '<rootDir>/jest/integration/runtime',
   ],
   moduleFileExtensions: [...baseConfig.moduleFileExtensions, 'cpp', 'h'],
   // This allows running Meta-internal tests with the `-test.fb.js` suffix.
   testRegex: '/__tests__/.*-itest(\\.fb)?\\.js$',
   testPathIgnorePatterns: baseConfig.testPathIgnorePatterns,
   transformIgnorePatterns: ['.*'],
-  testRunner: './jest/integration/runner/index.js',
-  watchPathIgnorePatterns: ['<rootDir>/jest/integration/build/'],
-  globalSetup: './jest/integration/runner/warmup/index.js',
+  testRunner: '<rootDir>/packages/react-native-fantom/runner/index.js',
+  watchPathIgnorePatterns: ['<rootDir>/packages/react-native-fantom/build/'],
+  globalSetup: '<rootDir>/packages/react-native-fantom/runner/warmup/index.js',
 };

jest/integration/config/jest.config.js renamed to packages/react-native-fantom/config/jest.config.js

@@ -106,7 +106,7 @@ module.exports = async function runTest(
   const setupModulePath = path.resolve(__dirname, '../runtime/setup.js');
   const featureFlagsModulePath = path.resolve(
     __dirname,
-    '../../../packages/react-native/src/private/featureflags/ReactNativeFeatureFlags.js',
+    '../../react-native/src/private/featureflags/ReactNativeFeatureFlags.js',
   );
 
   const entrypointContents = entrypointTemplate({