Deprecation: #65913 - Deprecate $TSFE->checkFileInclude 

See forge#65913

Description 

The public method in the global frontend controller $TSFE->checkFileInclude() has been marked as deprecated.

Affected installations 

Instances with extensions that make use of the method directly.

Migration 

Use the autoloader for classes or $TSFE->tmpl->getFileName() if needed.