ss: add a wrapper for the state system delete files

ss: add a wrapper for the state system delete files

This removes the need for the backend to be stored in the analysis

Change-Id: I32f4b1ceb99e4babf5ffe7e25731318ad8faa976
Signed-off-by: Matthew Khouzam <matthew.khouzam@ericsson.com>
Reviewed-on: https://git.eclipse.org/r/81298
Reviewed-by: Genevieve Bastien <gbastien+lttng@versatic.net>
Reviewed-by: Hudson CI
Reviewed-by: Alexandre Montplaisir <alexmonthy@efficios.com>