Breaking: #66861 - Do not automatically append a "/" to the identifier of a folder

See Issue #66861

Description

The Folder object automatically appended a / to the identifier. But as the Folder object should not manipulate the folder identifier this is removed.

Impact

Installations with custom FAL driver(s) could break.

Affected Installations

Installations with a custom FAL driver that relies on the / being added by the Folder object.

Migration

All drivers that depend on this / being added should be adjusted so the driver handles this.