Refactor: Removed Traefik configurations that exposes auth to the public internet

[PathumN99]

#7818 in opencrvs-core

• Removed Traefik configurations
• Replaced AUTH_URL usages in client & login apps with API_GATEWAY_URL/api/auth

[github-actions]

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[naftis]

I'm closing this as it's not currently a priority. I'll get back to this PR when we prioritize it for 1.7 or 1.8.