fix(externaldns): remove experimental Gateway API route sources

TLSRoute, GRPCRoute, TCPRoute, UDPRoute CRDs are not installed
(Traefik experimentalChannel: false), causing external-dns to crash
with a context deadline timeout on every sync cycle.

Keep only gateway-httproute which is the only route type in use.

apps/overlays/au-syd1/externaldns/values.yaml

@@ -25,10 +25,6 @@ sources:
   - service
   - ingress
   - gateway-httproute
-  - gateway-tlsroute
-  - gateway-grpcroute
-  - gateway-tcproute
-  - gateway-udproute
 
 # Environment variables for TSIG secret and algorithm from Vault
 env:
@@ -54,5 +50,3 @@ extraArgs:
   - --rfc2136-tsig-axfr
   - --rfc2136-tsig-secret=$(EXTERNAL_DNS_RFC2136_TSIG_SECRET)
   - --ingress-class=nginx
-
-logLevel: debug