Fix CI_SERVER_URL usage as it changes on external instances
>>> [!note] Migrated issue
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Reported by: [fjgarlin](https://www.drupal.org/user/2495842)
Related to !366 !356
>>>
<h3 id="summary-problem-motivation">Problem/Motivation</h3>
<p><span class="drupalorg-gitlab-issue-link project-issue-status-info project-issue-status-7"><a href="https://www.drupal.org/project/gitlab_templates/issues/3522611" title="Status: Closed (fixed)">#3522611: Add script to check "curl" return code and fail the job with clear message</a></span> started using <code>CI_SERVER_URL</code> to simplify some code, but if the templates are used in another instance, then the code that uses the variable will not work as expected.</p>
<h4 id="summary-steps-reproduce">Steps to reproduce</h4>
<p><a href="https://project.pages.drupalcode.org/gitlab_templates/info/setup/#using-the-templates-in-another-instance">https://project.pages.drupalcode.org/gitlab_templates/info/setup/#using-the-templates-in-another-instance</a></p>
<h3 id="summary-proposed-resolution">Proposed resolution</h3>
<p>Add a new hidden variable <code>DRUPALORG_CI_SERVER_URL</code> with value '<a href="https://git.drupalcode.org">https://git.drupalcode.org</a>' for use in the curl statements and curl script.</p>
<h3 id="summary-remaining-tasks">Remaining tasks</h3>
<p>MR</p>
> Related issue: [Issue #3522611](https://www.drupal.org/node/3522611)
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