[TASK] Stabilize FileClipboardCest ac test

Wait for the drop down to be ready
before clicking around on it.

Resolves: #104585
Releases: main, 12.4, 11.5
Change-Id: I9fa86d99b02c74bcc0f9efebce8fc4c2f8e54af5
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/85578


Tested-by: core-ci <typo3@b13.com>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>

typo3/sysext/core/Tests/Acceptance/Application/FileList/FileClipboardCest.php

@@ -77,7 +77,9 @@ final class FileClipboardCest
         $I->wait(1);
         $I->click('Clipboard #1 (multi-selection mode)');
         $I->click('.t3js-multi-record-selection-check-actions-toggle');
+        $I->waitForElementClickable('button[data-multi-record-selection-check-action="check-all"]');
         $I->click('button[data-multi-record-selection-check-action="check-all"]');
+        $I->waitForElementClickable('button[data-multi-record-selection-action="copyMarked"]');
         $I->click('button[data-multi-record-selection-action="copyMarked"]');
 
         foreach ($expectedFiles as $file) {