fix(helm): supervisor OTLP endpoint resolves cross-namespace (#3504)

Reported by external contributor. The supervisor template hardcoded a
short DNS name for `OTEL_EXPORTER_OTLP_ENDPOINT`, which the supervisor
then propagates verbatim into runner pods
(`apps/supervisor/src/workloadManager/kubernetes.ts:196`). When runners
are spawned in a different namespace via
`supervisor.config.kubernetes.namespace`, the short name doesn't resolve
and span/log export silently fails - runs complete fine but the
dashboard shows nothing.

Same FQDN pattern the chart already uses for
`TRIGGER_WORKLOAD_API_DOMAIN` (line 203). Verified with `helm template
trigger . --namespace my-ns` - renders
`http://trigger-webapp.my-ns.svc.cluster.local:3030/otel`.

Cheers Niels

hosting/k8s/helm/templates/supervisor.yaml

@@ -237,7 +237,7 @@ spec:
               value: {{ .Values.supervisor.config.debug | quote }}
             # OTEL
             - name: OTEL_EXPORTER_OTLP_ENDPOINT
-              value: "http://{{ include "trigger-v4.fullname" . }}-webapp:{{ .Values.webapp.service.port }}/otel"
+              value: "http://{{ include "trigger-v4.fullname" . }}-webapp.{{ .Release.Namespace }}.svc.cluster.local:{{ .Values.webapp.service.port }}/otel"
             {{- with .Values.supervisor.extraEnvVars }}
             {{- toYaml . | nindent 12 }}
             {{- end }}