Delegate thumbnail URL generation to ElementService

[Copilot]

The getPreviewThumbnail() method in GridData\Asset re-implemented thumbnail URL routing logic that already exists in ElementService::getThumbnailUrl(), including defaults like treepreview and cache-busting _dc parameter.

Changes

• Refactored getPreviewThumbnail() to delegate to ElementService::getThumbnailUrl()
• Removed duplicate URL generator initialization and route generation switch statement
• Preserved $onlyMethod parameter behavior for backward compatibility
• Added origin=folderPreview parameter to align grid preview thumbnails with folder preview thumbnails

Before

if (!empty($thumbnailMethod)) {
    $urlGenerator = \Pimcore::getContainer()->get('router');
    $routeParams = array_merge(['id' => $asset->getId()], $params);
    
    switch (true) {
        case $asset instanceof Model\Asset\Image:
            $thumbnailUrl = $urlGenerator->generate('pimcore_admin_asset_getimagethumbnail', $routeParams);
            break;
        // ... 4 more cases
    }
}

After

$elementService = \Pimcore::getContainer()->get(ElementService::class);
return $elementService->getThumbnailUrl($asset, $params);

Grid preview thumbnails now use: ['treepreview' => true, 'origin' => 'folderPreview', 'width' => 108, 'height' => 70, 'frame' => true]

This ensures list view and tile view thumbnail behavior remain aligned with folder preview thumbnails and automatically inherit defaults from ElementService.

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[brusch]

@copilot
add the parameters treepreview=1 and origin=folderPreview so that it is aligned with the folder preview thumbnails

[github-actions]

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[brusch]

@copilot comment "I have read the CLA Document and I hereby sign the CLA" on this PR

[Copilot]

@copilot
add the parameters treepreview=1 and origin=folderPreview so that it is aligned with the folder preview thumbnails

Added origin: 'folderPreview' parameter to the preview thumbnail call to align with folder preview thumbnails. The parameters now include both treepreview: true and origin: 'folderPreview'. Changes in commit ac56bf3.

[sonarqubecloud]

Quality Gate failed

Failed conditions
B Reliability Rating on New Code (required ≥ A)
1 New Major Issues (required ≤ 0)
1 New Bugs (required ≤ 0)

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[Copilot]

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