Issue #3353100 by Spokje, xjm: [random test failure] Try to un-skip and fix...

Issue #3353100 by Spokje, xjm: [random test failure] Try to un-skip and fix InlineBlockTest::testDeletion in context of [#3353085]

(cherry picked from commit a49a8f24)

core/modules/layout_builder/tests/src/FunctionalJavascript/InlineBlockTest.php

@@ -357,8 +357,6 @@ protected function assertBlockRevisionCountByTitle(string $block_title, int $exp
    * Tests that entity blocks deleted correctly.
    */
   public function testDeletion() {
-    // Skipped due to frequent random test failures.
-    $this->markTestSkipped();
     /** @var \Drupal\Core\Cron $cron */
     $cron = \Drupal::service('cron');
     /** @var \Drupal\layout_builder\InlineBlockUsageInterface $usage */