There's a few things that are really unncessary to log without any
debugging enabled, for example "Getting parental controls for user", so
remove that.
Other things can be useful, so use console.debug() to log those.
Especially the warning in showAppInfo() we don't want log by default as
it spills tons of messages during shell startup (the async
initialization of the malcontent manager takes some time).
While at it, also make the !HAVE_MALCONTENT message a bit more accurate.
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2196>
8a1c7ce590