Controller action Projects::NetworkController#show executes more than 100 SQL queries

Description

This controller executes more than 100 SQL queries, the maximum number of queries allowed as per MR https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/16466. The number of queries should be reduced to less than 100 and the corresponding whitelisted sections of code (Gitlab::QueryLimiting.whitelist('...')) should be removed.

Impact

This query goes from 1.5K to 20. See more details in #20782 (comment 539070911).