(Not so) Random test failures SettingsTrayIntegrationTest

Problem/Motivation

(At least) Since olivero became the new default theme in the standard profile in #3219959: Update standard profile so Olivero is the default theme, we're seeing a (dramatic) increase of test-failures in \Drupal\Tests\quickedit\FunctionalJavascript\SettingsTrayIntegrationTest like these:

1) Drupal\Tests\quickedit\FunctionalJavascript\SettingsTrayIntegrationTest::testQuickEditLinks
WebDriver\Exception\UnknownError: element click intercepted: Element ... is not clickable at point (504, 188). Other element would receive the click: ...
  (Session info: headless chrome=98.0.4758.102)
  (Driver info: chromedriver=98.0.4758.102 (273bf7ac8c909cde36982d27f66f3c70846a3718-refs/branch-heads/4758@{#1151}),platform=Linux 4.9.0-0.bpo.6-amd64 x86_64)

/var/www/html/vendor/instaclick/php-webdriver/lib/WebDriver/Exception.php:156
/var/www/html/vendor/instaclick/php-webdriver/lib/WebDriver/AbstractWebDriver.php:165
/var/www/html/vendor/instaclick/php-webdriver/lib/WebDriver/AbstractWebDriver.php:245
/var/www/html/vendor/instaclick/php-webdriver/lib/WebDriver/Container.php:239
/var/www/html/vendor/behat/mink-selenium2-driver/src/Selenium2Driver.php:806
/var/www/html/vendor/behat/mink-selenium2-driver/src/Selenium2Driver.php:792
/var/www/html/core/tests/Drupal/FunctionalJavascriptTests/DrupalSelenium2Driver.php:146
/var/www/html/core/tests/Drupal/FunctionalJavascriptTests/DrupalSelenium2Driver.php:205
/var/www/html/core/tests/Drupal/FunctionalJavascriptTests/DrupalSelenium2Driver.php:157
/var/www/html/vendor/behat/mink/src/Element/NodeElement.php:153
/var/www/html/core/modules/settings_tray/tests/src/FunctionalJavascript/SettingsTrayTestBase.php:54
/var/www/html/core/modules/quickedit/tests/src/FunctionalJavascript/SettingsTrayIntegrationTest.php:117
/var/www/html/vendor/phpunit/phpunit/src/Framework/TestResult.php:726

Why?

Over on #3219959-83: Update standard profile so Olivero is the default theme I've created a patch that shows a screenshot of (what I think is) the issue, attached it here as well.
The QuickEdit Toolbar (barely) covers a little bit of the "Powered By"-block. (Depending on the characters in the name of the user that was created to create the blocks, there's the randomness.)

We perform a click on that block. That's a rather big place to do a click on, somehow the click() command seems to like to click exactly on the tiny spot that is covered by the QuickEdit-toolbar. Which in turn causes the block not receiving the click like the error above states.

Proposed resolution

There's a difference in the number of blocks in the core/themes/olivero/config/optional directory between 9.4/9.5 and 10.0. In #3219959: Update standard profile so Olivero is the default theme we moved blocks for 9.4 and 9.5, whilst in 10.0 we copied them.

Looking at the screenshots I've made locally and attached here for Olivero and Bartik whilst running \Drupal\Tests\quickedit\FunctionalJavascript\SettingsTrayIntegrationTest, copying looks better and passes the test.

Let's restore the blocks in core/themes/olivero/config/optional so we have:

- the same amount of blocks between 9.4/9.5 and 10.0
- a passing \Drupal\Tests\quickedit\FunctionalJavascript\SettingsTrayIntegrationTest

Previously attempted resolution

Move the block that is tested to be the bottom block on the page. The QuickEdit Toolbar is always _above_ the field that is being edited. If our block is below it, it will never be covered.