Revert "chore(tests): redirect debugError to the output category of tests (#2969)" (#2987)

This reverts commit c5fe1dbdbb.

lib/Tracing.js

@@ -13,7 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-const {helper, assert, debugError} = require('./helper');
+const {helper, assert} = require('./helper');
 const fs = require('fs');
 
 const openAsync = helper.promisify(fs.open);
@@ -89,8 +89,6 @@ class Tracing {
     let resultBuffer = null;
     try {
       resultBuffer = Buffer.concat(bufs);
-    } catch (error) {
-      debugError(error);
     } finally {
       return resultBuffer;
     }