Backport EE changes to config/application.rb

What does this MR do?

This backports the EE changes made to this config file to CE. EE specific bits do not need an if Gitlab.ee?, as everything will work transparently when using CE.

EE MR: https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/14093

Does this MR meet the acceptance criteria?

Conformity

• Code review guidelines
• Merge request performance guidelines
• Style guides
• Database guides
• Separation of EE specific content