Add cert mgr installation which is required by HPTO

[emeraldbay]

Description

Add latest cert-mgr to the helm chart, which is required by https://docs.aws.amazon.com/sagemaker/latest/dg/sagemaker-eks-operator.html. We want HPTO installed by default, so we also need to install cert mgr by default.

Install the cert mgr under cert-mgr namespace

Testing

helm install dependencies helm_chart/HyperPodHelmChart --namespace kube-system

NAME: dependencies
LAST DEPLOYED: Sun Aug  3 22:51:06 2025
NAMESPACE: kube-system
STATUS: deployed
REVISION: 1
TEST SUITE: None

❯ kubectl get pods --namespace cert-manager
NAME                                                  READY   STATUS    RESTARTS   AGE
dependencies-cert-manager-744cf98f4c-clrxp            1/1     Running   0          4m19s
dependencies-cert-manager-cainjector-c59886c7-hqg2s   1/1     Running   0          4m19s
dependencies-cert-manager-webhook-d565d68d9-bmx8t     1/1     Running   0          4m19s

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[emeraldbay]

PR Checks / integration-tests (311) (pull_request_target) not related to this change

https://github.com/aws/sagemaker-hyperpod-cli/actions/runs/16711033166/job/47296014864?pr=180

Saw it failed in other PR as well