[CLI] Repeating trial cancellation message.

**System Information (please complete the following information):**
- CLI Version: 16.12.2+86688637e3ba4b906f5adf37b767fee124189da7
- OS: Windows 11
- Architecture: x64

**Describe the bug**
- On which step of the process did you run into an issue: Training
- Clear description of the problem: When time expires and a trial is running, the trial is cancelled. A message, `Trial 23 encounter error with message: One or more errors occurred. (Operation was canceled.)`, is displayed more than once on the console.

**To Reproduce**
Steps to reproduce the behavior:
1. Train a classification model using the CLI

**Expected behavior**

When a trial is cancelled, only display the message once.

**Screenshots**


**Additional context**

Log file:
[log.txt](https://github.com/dotnet/machinelearning-modelbuilder/files/8018585/log.txt)

Start by reproducing the cancellation during classification-model training with the CLI and compare the repeated console output with log.txt. Trace where the trial-cancellation error is reported, then verify that a cancelled trial produces one message rather than duplicates.

Written by the indexing model from the issue text.