Add getTestId into views/common (#37851)

Summary:
Pull Request resolved: #37851

## Changelog
[Internal] -

The `testId` value in practice can be used for other things than e2e tests - e.g. there is already a use case for Accessibility, but also we may want to log it as an extra data point with e.g. performance metrics.

This exposes a helper function to extract a `testId` from a view.

Differential Revision: D46684365

fbshipit-source-id: 17602307c468a906ef4d0679e826dbcd1eb651b7

packages/react-native/ReactAndroid/src/main/java/com/facebook/react/views/common/ViewUtils.java

@@ -0,0 +1,27 @@
+/*
+ * 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.
+ */
+
+package com.facebook.react.views.common;
+
+import android.view.View;
+import com.facebook.react.R;
+
+/** Class containing static methods involving manipulations of Views */
+public class ViewUtils {
+
+  /**
+   * Returns value of testId for the given view, if present
+   *
+   * @param view View to get the testId value for
+   * @return the value of testId if defined for the view, otherwise null
+   */
+  public static String getTestId(View view) {
+    return view.getTag(R.id.react_test_id) instanceof String
+        ? (String) view.getTag(R.id.react_test_id)
+        : null;
+  }
+}