chore: move dp cluster to traefik (appsmithorg#41600)

## Description
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Fixes #`Issue Number`  
_or_  
Fixes `Issue URL`
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## Automation

/ok-to-test tags=""

### 🔍 Cypress test results
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## Communication
Should the DevRel and Marketing teams inform users about this change?
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<!-- This is an auto-generated comment: release notes by coderabbit.ai
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## Summary by CodeRabbit

* **Chores**
* Enhanced deployment reliability by implementing graceful service
shutdown before cleanup operations in the recreation flow.
* Updated ingress controller configuration and removed SSL certificate
annotation from load balancer settings.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

Author: wyattwalter

scripts/deploy_preview.sh

@@ -55,7 +55,7 @@ if [[ -n "${RECREATE-}" ]]; then
   # execute this db.dropDatabase() from the k8s cluster because there's network restrictions on Atlas cluster.
   # The \$ is used to escape the $ character in the APPSMITH_DB_URL environment variable so it's interpolated inside the kubectl exec command.
   kubectl exec "$pod_name" -n "$NAMESPACE" -- bash -c "mongosh \$APPSMITH_DB_URL --eval 'db.dropDatabase()'"
-  kubectl exec "$pod_name" -n "$NAMESPACE" -- bash -c "rm -rf /appsmith-stacks/*"
+  kubectl exec "$pod_name" -n "$NAMESPACE" -- bash -c "supervisorctl stop all && rm -rf /appsmith-stacks/*"
   kubectl delete ns "$NAMESPACE" || true
   kubectl patch pv "$NAMESPACE-appsmith" -p '{"metadata":{"finalizers":null}}' || true
   kubectl delete pv "$NAMESPACE-appsmith" --grace-period=0 --force || true
@@ -103,10 +103,9 @@ helm upgrade -i "$CHARTNAME" "appsmith-ee/$HELMCHART" -n "$NAMESPACE" --create-n
   --set postgresql.enabled=false \
   --set mongodb.enabled=false \
   --set ingress.enabled=true \
-  --set "ingress.annotations.service\.beta\.kubernetes\.io/aws-load-balancer-ssl-cert=$AWS_RELEASE_CERT" \
   --set "ingress.hosts[0].host=$DOMAINNAME, ingress.hosts[0].paths[0].path=/, ingress.hosts[0].paths[0].pathType=Prefix" \
   --set autoupdate.enabled=false \
-  --set ingress.className="nginx" \
+  --set ingress.className="traefik" \
   --set persistence.efs.enabled=true \
   --set persistence.efs.driver="efs.csi.aws.com" \
   --set persistence.storageClass="efs-sc" \