Refactor cert-manager and ExternalDNS configurations

- Updated the namespace for the internal wildcard certificate from 'internal' to 'cert-manager'.
- Adjusted the DNS zone selectors in Let's Encrypt configurations to use CLOUDFLARE_DOMAIN consistently.
- Changed the namespace for the wildcard certificate from 'default' to 'cert-manager'.
- Modified ExternalDNS configuration to use OWNER_ID instead of CLUSTER_ID for TXT owner ID.
- Cleaned up setup-cert-manager.sh by removing unnecessary internal namespace creation and secret duplication.
- Updated certificate wait commands to reflect the new namespace structure.
- Simplified the copying of certificates to the example-admin namespace.
- Removed test service deployment from setup-externaldns.sh for a cleaner setup process.

infrastructure_setup/externaldns/externaldns.yaml

@@ -57,9 +57,9 @@ spec:
             - --source=service
             - --source=ingress
             - --provider=cloudflare
-            - --txt-owner-id=${CLUSTER_ID}
+            - --txt-owner-id=${OWNER_ID}
             - --log-level=debug
-            - --publish-internal-services # Also publish internal services
+            - --publish-internal-services
             - --no-cloudflare-proxied
           env:
             - name: CF_API_TOKEN