Fix HEAD tests Tests: 35, Errors: 1, Failures: 3.

Problem/Motivation

As of 29th of may 2024:
Tests: 35, Assertions: 203, Errors: 1, Failures: 3.
Time: 01:29.993, Memory: 10.00 MB
There was 1 error:
1) Drupal\Tests\panels_ipe\FunctionalJavascript\PageManagerIntegrationTest::testIPEChangeLayout
RuntimeException: Unfinished AJAX requests while tearing down a test
/builds/project/panels/web/core/tests/Drupal/FunctionalJavascriptTests/WebDriverTestBase.php:113
--
There were 3 failures:
1) Drupal\Tests\panels_ipe\FunctionalJavascript\PageManagerIntegrationTest::testBlockPreviewAndCustomCssProperties
JavaScript condition met:
(0 === jQuery.active && 0 === jQuery(':animated').length)

Failed asserting that false is true.
/builds/project/panels/vendor/phpunit/phpunit/src/Framework/Constraint/Constraint.php:122
/builds/project/panels/vendor/phpunit/phpunit/src/Framework/Constraint/Constraint.php:56
/builds/project/panels/web/core/tests/Drupal/FunctionalJavascriptTests/WebDriverTestBase.php:171
/builds/project/panels/panels_ipe/tests/src/FunctionalJavascript/PanelsIPETestTrait.php:297

2) Drupal\Tests\panels_ipe\FunctionalJavascript\PageManagerIntegrationTest::testBlockEditAndCustomCssProperties
New block was placed on screen.

Failed asserting that false is not false.
/builds/project/panels/vendor/phpunit/phpunit/src/Framework/Constraint/Constraint.php:122
/builds/project/panels/vendor/phpunit/phpunit/src/Framework/Constraint/Constraint.php:56
/builds/project/panels/panels_ipe/tests/src/FunctionalJavascript/PanelsIPETestTrait.php:162
/builds/project/panels/panels_ipe/tests/src/FunctionalJavascript/PageManagerIntegrationTest.php:141

3) Drupal\Tests\panels_ipe\FunctionalJavascript\PageManagerIntegrationTest::testIPEAddBlock
New block was placed on screen.

Failed asserting that false is not false.
/builds/project/panels/vendor/phpunit/phpunit/src/Framework/Constraint/Constraint.php:122
/builds/project/panels/vendor/phpunit/phpunit/src/Framework/Constraint/Constraint.php:56
/builds/project/panels/panels_ipe/tests/src/FunctionalJavascript/PanelsIPETestTrait.php:162
/builds/project/panels/panels_ipe/tests/src/FunctionalJavascript/PanelsIPETestBase.php:39

ERRORS!
Tests: 35, Assertions: 203, Errors: 1, Failures: 3.

Steps to reproduce

Run pipeline

Proposed resolution

TBD

Remaining tasks

TBD

User interface changes

TBD

API changes

TBD

Data model changes

N/A