feat: update Redis helm chart docs and network policies lab

[ferruhcihan]

📌 Summary

This PR updates Redis helm chart docs and network policies lab according to the apl-charts repository’s redis-ha chart changes.

Ticket: https://track.akamai.com/jira/browse/APL-1079
PRs: apl-api | apl-charts

🔍 Reviewer Notes

Testing:

• Create a cluster (select g6-dedicated-8 to avoid hitting resource limits),
  or update the otomi-api app _rawValues in your cluster:

        image:
            # registry: docker.io
            # repository: linode/apl-api
            pullPolicy: Always
            tag: APL-1079

• In team-admin, navigate to the Catalog page in the console and add a new redis-ha Helm chart using this Chart.yaml link: https://github.com/linode/apl-charts/blob/APL-1079/redis-ha/Chart.yaml
• Go back to your desired team (e.g. team-demo)
• Follow the Network Policies lab with these changes.
• Verify that the new Redis pods and resources are working as expected.

[jverma-git]

@ferruhcihan does this mean that the existing netpol automation needs to be changed ?
for example, we have this now.

    values = load_values_from_chart(otomi_charts_repo, "k8s-deployment")
    values["image"]["repository"] = image_url
    values["image"]["tag"] = "main"
    values["containerPorts"] = [{"name": "http", "containerPort": 80, "protocol": "TCP"}]
    values["env"].append({"name": "REDIS_HOST", "value": f"{redis_workload.name}-quickstart-redis-master"})

So
values["env"].append({"name": "REDIS_HOST", "value": f"{redis_workload.name}-redis-ha"}) ?

[ferruhcihan]

@ferruhcihan does this mean that the existing netpol automation needs to be changed ? for example, we have this now.

    values = load_values_from_chart(otomi_charts_repo, "k8s-deployment")
    values["image"]["repository"] = image_url
    values["image"]["tag"] = "main"
    values["containerPorts"] = [{"name": "http", "containerPort": 80, "protocol": "TCP"}]
    values["env"].append({"name": "REDIS_HOST", "value": f"{redis_workload.name}-quickstart-redis-master"})

So values["env"].append({"name": "REDIS_HOST", "value": f"{redis_workload.name}-redis-ha"}) ?

@jverma-git Yes, REDIS_HOST will be the redis workload name. So, for both the vote and worker workloads, the line will be like: values["env"].append({"name": "REDIS_HOST", "value": f"{redis_workload.name}"}) ?