Tweak Selenium timeout to reduce performance testing flakiness
>>> [!note] Migrated issue
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Reported by: [phenaproxima](https://www.drupal.org/user/205645)
Related to !724
>>>
<p>The performance testing is being really flaky: <a href="https://git.drupalcode.org/project/drupal_cms/-/jobs/7727356">https://git.drupalcode.org/project/drupal_cms/-/jobs/7727356</a></p>
<p>@catch and I think it's timing out because the site template(s) take a long time to install, which makes sense given their relative heft. Let's try tweaking the SE_SESSION_TIMEOUT variable in CI to reduce the possibility of this happening.</p>
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