Log script activities and deleted toplevel cache files/directories.
Use sudo to override permissions in cache.
Remove legacy single file based cache if it exists by error.
Create cache directory with appropriate permissions if missing.
Pick-to: 6.4 6.3 6.2 5.15
Change-Id: Id6ad930bf8ba9233eeea8a7602d25c98d0058409
Reviewed-by: Simo Fält <simo.falt@qt.io>
