Add DNS section and Route53 diagram
Why is this change being made?
The current application diagram is already quite large. Adding route53 to its own section.
Closes: https://gitlab.com/gitlab-com/gl-infra/infrastructure/issues/8805
Does this MR meet the acceptance criteria?
Conformity
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Added description to this MR explaining the reasons for the proposed change, per say-why-not-just-what