Add instrumentation classed for settings metrics

As a part of the effort to remove usage_data we need to add instrumentation classed for system_usage_data_settings metrics https://gitlab.com/gitlab-org/gitlab/-/blob/master/lib/gitlab/usage_data.rb#L176

There are 9 metrics, 5 of them already have classes just need to remove it from usage_data and update spec. For the rest 4 need to create instrumentation classes.