Fixes #38767 - Add BMC Smart Proxy to host.smart_proxy_ids

[stejskalleos]

If a subnet has only a BMC proxy assigned,
this smart proxy will be ignored in the host.smart_proxies results.

This fix includes BMC proxies in the result.

Found during the testing of #10561 (power_action_v2 method)

[adamruzicka]

Oh, this went in fast.

I was wondering if rather than manually building a list, we could leverage smart proxy references instead? We wouldn't have to maintain a list here and we wouldn't have to extend said list from plugins.

Something along the lines of this

def smart_proxy_ids
  self.class.smart_proxy_ids(self.class.where(id: id))
end

Well, guess that ship has already sailed.