Deprecation: #77477 - TemplateService->fileContent

See forge#77477

Description

The method fileContent within the class TemplateService has been marked as deprecated.

Impact

Calling the method will trigger a deprecation log entry.

Affected Installations

Any TYPO3 instance with a third-party extension calling the method directly.

Migration

Implement the same logic directly in PHP with getFileName() and file_get_contents().