The Special:CommunityConfiguration page is listed below in the "Other special pages" section. That page contains links to all the CommunityConfiguration available, including that from other Extensions (for example, AutoModerator).

If we want a link in the GrowthExperiments section that is basically just a redirect to that general CommunityConfiguration overview page, then that would be relatively easy to do. If, on the other hand, we want there a special page that only has the GrowthExperiments-specific configuration providers listed, then that would design and probably also somewhat more effort.

maybe it's worth also to list EnrollAsMentor page on Special:SpecialPages?

The link "Mentor Dashboard" redirects one to Special:EnrollAsMentor if one is not a mentor yet. If we should change that behavior, then that would be a separate task.

some of the links to special pages are displayed as bold. According to the legend those pages are Restricted special pages. Not sure what that status indicates exactly. Could such status, Restricted special pages i.e. be applicable to some of the Growth-related special pages?

It is my understanding that Restricted special pages are those that are not visible to all users, but only to those with sufficient rights. Math status being visible to anonymous users is probably a bug somehow. If we want to hide some of the Growth special pages from some users, then that needs to be clearly specified. Which pages do we want to hide from which users? For example, hiding "MentorDashboard" incl. EnrollAsMentor" from users without an account makes sense to me. But only from anonymous users or also from those that don't meet the requirements for being a mentor? In either case, that should again be a separate task.

I'm changing this to a normal task as the current behavior is as specified (if there ever was any specification). If we are expected to pick this up and change current behavior, then it needs clear requirements.