Mitigate flakiness in iOS (facebook#38894)

Summary:
Pull Request resolved: facebook#38894

This diff introduces a script `run_with_retry` that we can apply to single commands in order to mitigate the flakiness.

This can be useful when networking is involved, to retry installing some dependencies, or for example with some e2e/integration tests.

The diff applies this rerun to the iOS tests so we mitigate failures in CI.

## Changelog:
[Internal] - Add script to retry CI steps and mitigate iOS flakyness.

Reviewed By: cortinico

Differential Revision: D48189365

fbshipit-source-id: a0e115754bcdb8f8353bb5f070163f8cf8f7c9cf

.circleci/config.yml

@@ -813,7 +813,7 @@ jobs:
           steps:
             - run:
                 name: "Run Tests: iOS Unit and Integration Tests"
-                command: yarn test-ios
+                command: node ./scripts/circleci/run_with_retry.js 3 yarn test-ios
             - run:
                 name: Zip Derived data folder
                 when: always

scripts/circleci/run_with_retry.js

@@ -0,0 +1,40 @@
+/**
+ * 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.
+ *
+ * @format
+ */
+
+const {spawnSync} = require('child_process');
+
+function retryCommand(maxRetries, command) {
+  for (let i = 1; i <= maxRetries; i++) {
+    console.log(`Attempt ${i}: ${command}`);
+    const result = spawnSync(command, {shell: true, stdio: 'inherit'});
+
+    if (result.status === 0) {
+      console.log(`Command succeeded on attempt ${i}`);
+      process.exit(0);
+    } else {
+      console.log(`Command failed on attempt ${i}`);
+      if (i < maxRetries) {
+        console.log('Retrying...');
+      } else {
+        console.log('Maximum retries reached. Exiting.');
+        process.exit(1);
+      }
+    }
+  }
+}
+
+const maxRetries = process.argv[2];
+const command = process.argv.slice(3).join(' ');
+
+if (!maxRetries || !command) {
+  console.log('Usage: node retry_script.js <max_retries> <command>');
+  process.exit(1);
+}
+
+retryCommand(maxRetries, command);