Remove dependency on event-target-shim (#50494)

Summary:
Pull Request resolved: #50494

Changelog: [internal]

Removes the dependency on the `event-target-shim` npm package now that we're using a custom implementation within `react-native`.

Reviewed By: yungsters

Differential Revision: D67828636

fbshipit-source-id: 8727f8caa2bd4badd7162eb7b993dcc768e74b85

Author: rubennorte

packages/metro-config/src/index.flow.js

@@ -30,7 +30,6 @@ const INTERNAL_CALLSITES_REGEX = new RegExp(
     '/metro-runtime/.+\\.js$',
     '/node_modules/@babel/runtime/.+\\.js$',
     '/node_modules/@react-native/js-polyfills/.+\\.js$',
-    '/node_modules/event-target-shim/.+\\.js$',
     '/node_modules/invariant/.+\\.js$',
     '/node_modules/react-devtools-core/.+\\.js$',
     '/node_modules/react-native/index.js$',

packages/react-native/Libraries/WebSocket/__mocks__/event-target-shim.js

@@ -122,7 +122,6 @@
     "base64-js": "^1.5.1",
     "chalk": "^4.0.0",
     "commander": "^12.0.0",
-    "event-target-shim": "^5.0.1",
     "flow-enums-runtime": "^0.0.6",
     "glob": "^7.1.1",
     "invariant": "^2.2.4",