Unify test-e2e command in rn-tester-e2e pacakge (#38701)

Summary:
This PR is small cleanup in scripts in `rn-tester-e2e` package, it creates unified script so that we can easily pass platform as an argument. Context: #36267 (comment)

## Changelog:
[INTERNAL] [CHANGED] - Unify `test-e2e` command in `rn-tester-e2e` package

Pull Request resolved: #38701

Test Plan: CI Green ✅

Reviewed By: NickGerleman, cipolleschi

Differential Revision: D47949821

Pulled By: cortinico

fbshipit-source-id: 90bbc96281e89dec505999ff5e51db7ca78da6dc

Author: szymonrybczak

.circleci/config.yml

@@ -790,7 +790,7 @@ jobs:
           name: Run E2E tests
           command: |
             cd packages/rn-tester-e2e
-            yarn test-ios-e2e
+            yarn test-e2e ios
 
   # -------------------------
   #     JOBS: Android E2E Tests
@@ -849,7 +849,7 @@ jobs:
           name: Run E2E tests
           command: |
             cd packages/rn-tester-e2e
-            yarn test-android-e2e
+            yarn test-e2e android
   # -------------------------
   #    JOBS: Test Android
   # -------------------------

packages/rn-tester-e2e/README.md

@@ -105,8 +105,8 @@ Now, make sure that the iOS simulator/the Android emulator is up and running.
 Finally, you can open a third terminal window and run:
 
 ```bash
-yarn test-android-e2e # for android
-yarn test-ios-e2e # for ios
+yarn test-e2e android # for android
+yarn test-e2e ios # for ios
 ```
 
 Now you should see the RNTester app being open, and the defined test being run.

packages/rn-tester-e2e/package.json

@@ -11,9 +11,7 @@
   "directory": "packages/rn-tester-e2e"
   },
   "scripts": {
-    "test": "jest --runInBand",
-    "test-android-e2e": "E2E_DEVICE=\"android\" yarn test",
-    "test-ios-e2e": "E2E_DEVICE=\"ios\" yarn test"
+    "test-e2e": "node ./../../scripts/e2e/run-e2e-tests.js"
   },
   "devDependencies": {
     "appium": "^2.0.0",

scripts/e2e/run-e2e-tests.js

@@ -0,0 +1,16 @@
+/**
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+const SUPPORTED_PLATFORMS = ['ios', 'android'];
+
+if (process.argv.length !== 3 || !SUPPORTED_PLATFORMS.includes(process.argv[2])) {
+  throw new Error(`Invalid platform. Supported platforms are: ${SUPPORTED_PLATFORMS.join(', ')}`);
+}
+
+const platform = process.argv[2];
+const { execSync } = require('child_process');
+execSync(`E2E_DEVICE=${platform} jest --runInBand`, { stdio: 'inherit' });