[chore] Updated k8s manifests based on last Helm changes (#1982)

Co-authored-by: Pierre Tessier <[email protected]>

kubernetes/opentelemetry-demo.yaml

@@ -9453,7 +9453,7 @@ spec:
             - --web.console.libraries=/etc/prometheus/console_libraries
             - --web.console.templates=/etc/prometheus/consoles
             - --enable-feature=exemplar-storage
-            - --enable-feature=otlp-write-receiver
+            - --web.enable-otlp-receiver
           ports:
             - containerPort: 9090
           readinessProbe: