Random failure in Drupal\Tests\settings_tray\FunctionalJavascript\SettingsTrayBlockFormTest::testEditModeEnableDisable

This has resurfaced, and this issue made me wonder whether https://git.drupalcode.org/project/drupalci_testbot/-/commit/b5e9ad15bcb... has regressed on gitlab which would then explain a lot of stability issues. However neither me nor @fjgarlin is sure exactly what the equivalent is on gitlab. I'd opened 🐛 [random test failure] SettingsTrayBlockFormTest:: testEditModeEnableDisable() Active which was a duplicate before rediscovering this.

https://git.drupalcode.org/project/drupal/-/jobs/259057 (1st November 2023).

Postponed on 📌 Skip SettingsTrayBlockFormTest::testEditModeEnableDisable due to random fails Needs review

Adding what this is postponed on to the remaining tasks per Remining tasks → .

This is explicitly not fixed by 📌 Stabilize FunctionalJavascript testing AJAX: add ::assertExpectedAjaxRequest() Fixed so we should revive it.
I'm also seeing

 Drupal\Tests\settings_tray\FunctionalJavascript\SettingsTrayBlockFormTest::testBlocks
    Failed asserting that a NULL is not empty.

Green again.

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