[BUGFIX] Use _LOCALIZED_UID also for pages in Extbase persistence

When pages use overlays, the special key "_PAGES_OVERLAY_UID"
is used (PageRepository->getPageOverlay), for other
pages doing overlays, the property "_LOCALIZED_UID" is used
(PageRepository->getRecordOverlay).

Extbase is setting the special property $_localizedUid in
a Domain Model, based on the key "_LOCALIZED_UID" in the
DataMapper. The Typo3DbBackend now maps the _PAGES_OVERLAY_UID
onto the _LOCALIZED_UID in order to have Extbase deal with
language overlays in pages as well.

Resolves: #88951
Releases: main, 12.4
Change-Id: If0b462d0373cf63fcdb78b75cc0f3381c85eee8d
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/82147
Tested-by: Oliver Bartsch <bo@cedev.de>
Tested-by: core-ci <typo3@b13.com>
Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Tested-by: Benni Mack <benni@typo3.org>
Reviewed-by: Benni Mack <benni@typo3.org>
Reviewed-by: Oliver Bartsch <bo@cedev.de>

typo3/sysext/extbase/Classes/Persistence/Generic/Storage/Typo3DbBackend.php

@@ -511,6 +511,11 @@ protected function overlayLanguageAndWorkspaceForSingleRecord(string $tableName,
         if (is_array($row) && $fetchLocalizedRecord) {
             if ($tableName === 'pages') {
                 $row = $pageRepository->getLanguageOverlay($tableName, $row);
+                // DataMapper only checks for _LOCALIZED_UID when setting '_localizedUid' property
+                // and not _PAGES_OVERLAY_UID.
+                if (isset($row['_PAGES_OVERLAY_UID'])) {
+                    $row['_LOCALIZED_UID'] = $row['_PAGES_OVERLAY_UID'];
+                }
             } else {
                 if (!$querySettings->getRespectSysLanguage()
                     && $languageOfCurrentRecord > 0