Rework sorting for the Enabled columns of Installed in Plugin Manager

This is detached from JENKINS-59665 by jsoref

open /pluginManager/installed (Jenkins 2.198)

Have:

1. a couple of plugins with dependencies (enabled)
2. a couple of plugins (disabled)
3. a couple of plugins that have never been upgraded
4. a couple of plugins which have been upgraded

Actual results

I can't really explain what it's doing. – It appears to be stable (i.e. toggling the sort direction for one of these columns reverses the sort), but it isn't global (i.e. changing the sort key to a different column, e.g. Name, and then back to the Enabled column results in a new sort).

Expected results

Sorting by Enabled should sort into three sets:

1. Enabled (checkbox checked)
2. Enabled (checkbox disabled) and can't be disabled (because they're used by enabled plugins)
3. Disabled (checkbox unchecked)