Important: #84985 - Unified Workspace Restriction for Database Queries 

See forge#84985

Description 

A new WorkspaceRestriction is added to overcome certain downsides of the existing FrontendWorkspaceRestriction and BackendWorkspaceRestriction. The new workspace restriction limits a SQL query to only select records which are "online" (pid != -1) and in live or current workspace.

As an important note and limitation of any workspace-related restrictions, fetching the exact records need to be handled after the SQL results are fetched, by overlaying the records with BackendUtility::getRecordWSOL(), PageRepository->versionOL() or PlainDataResolver.

For now, the WorkspaceRestriction must be used explicitly in various contexts and is not applied automatically.