Add OpenShift Egress IPs to Allow List

[dbarkowsky]

Summary

Small changes to make sure that other applications in OpenShift can pass through the public routes.

List of IPs comes from this resource: https://digital.gov.bc.ca/technology/cloud/private/internal-resources/topology/

Thought for anyone who might review this
Do we need the backend route when the frontend proxies it for us?

Checklist

By submitting this pull request, I acknowledge that I have attempted to meet the following:

• a self-review of my code
• commented code particularly in hard-to-understand areas
• corresponding changes to the documentation where required
• changes tested to the best of my ability
• no new errors or non-functional code