[cwctl] do only clean static data dir content (closes #17069762) deleting the directory itself is useless and may be a problem in automated deployment environments (user may not have permissions to delete or create that directory).

[cwctl] add a no-config-update option to the upgrade command (closes #17069607)

[cwconfig] Add "pyramid" config type to MCOMPAT dict I don't know what this is for exactly, but the accept_mode method below queries this dict with the configuration type name. And if the latter is "pyramid", it crashes since there's no key in MCOMPAT dict. So add one with the same value as "all-in-one". This code is called during "upgrade" migration in particular.