Issue #3351607 by schlaukopf, xjm: Skip numerous functional JS tests that repeatedly break HEAD

(cherry picked from commit 70cfa8b4f7)

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

@@ -61,6 +61,8 @@ class InlineBlockPrivateFilesTest extends InlineBlockTestBase {
    * Tests access to private files added to inline blocks in the layout builder.
    */
   public function testPrivateFiles() {
+    // Skipped due to frequent random test failures.
+    $this->markTestSkipped();
     $assert_session = $this->assertSession();
     $this->drupalLogin($this->drupalCreateUser([
       'access contextual links',

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

@@ -350,6 +350,8 @@ class InlineBlockTest extends InlineBlockTestBase {
    * 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 */