Fixes #16689 - DRY index action with search

Refs #16689 - Missing DRY index action controllers

Some of the controllers that could have used the refactor in #16689 were
not added in that commit.

Additionally, I've fixed the '.includes' leftover in those controllers
from Rails 3 to be '.eager_load' now. '.includes' does not change the
query in any way unless you call '.references' afterwards.

refs #16689 - expand array of eager load tables

Previously an array of tables (e.g. on Puppetclasses, SubnetsController)
triggered false positive warnings from Bullet:

| Unused Eager Loading detected
|   Subnet::Ipv4 => [[:domains, :dhcp]]

and when no tables were passed on most index pages:

| Unused Eager Loading detected
|   Domain => [[]]