Breaking: #77591 - Removed WorkspaceService->isOldStyleWorkspaceUsed

See forge#77591

Description

The method WorkspaceService->isOldStyleWorkspaceUsed() was removed without substitution. It existed to identify if Workspaces still were configured for TYPO3 4.4.

Impact

Calling the PHP method directly will result in a fatal PHP error.

Affected Installations

TYPO3 installations using workspaces and extending the workspaces functionality extensively by providing a fallback layer to functionality for TYPO3 4.4 or lower.

Migration

Remove any occurrences to the PHP method.