Changes

Update ghpr_mysql_test.groovy (#3026)

### **PR Type**
enhancement


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### **Description**
- Enhanced the Jenkins pipeline script to archive artifacts upon test
failure.
- Added an `unsuccessful` post condition to ensure
`tidb-test/mysql_test/mysql-test.out` is archived with fingerprinting.



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### **Changes walkthrough** 📝
<table><thead><tr><th></th><th align="left">Relevant
files</th></tr></thead><tbody><tr><td><strong>Enhancement</strong></td><td><table>
<tr>
  <td>
    <details>
<summary><strong>ghpr_mysql_test.groovy</strong><dd><code>Add artifact
archiving on test failure</code>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;
&nbsp; &nbsp; &nbsp; &nbsp; </dd></summary>
<hr>

pipelines/PingCAP-QE/tidb-test/latest/ghpr_mysql_test.groovy

<li>Added <code>unsuccessful</code> post condition to archive
artifacts.<br> <li> Archives
<code>tidb-test/mysql_test/mysql-test.out</code> with
fingerprinting.<br>


</details>


  </td>
<td><a
href="https://github.com/PingCAP-QE/ci/pull/3026/files#diff-06a9f5ee80e12b12f407a03f22f0c7e7c25a6b334f9c732ac9c745f49f513c1a">+3/-0</a>&nbsp;
&nbsp; &nbsp; </td>

</tr>                    
</table></td></tr></tr></tbody></table>

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Co-authored-by: Purelind <purelind@users.noreply.github.com>
 (commit: e2f7aa6)