docs: add VPA Helm installation guide

[iacker]

Summary

• add a new task page documenting how to install Vertical Pod Autoscaler using the upstream Helm chart
• link the VPA concept page to the new installation guide
• note the current upstream warning that the Helm chart is still under development

Validation

• npm ci
• make module-init
• independent content review against upstream autoscaler docs/chart README
• local Hugo preview blocked because hugo is not installed in this environment

Related to kubernetes/autoscaler#9407

[k8s-ci-robot]

Welcome @iacker!

It looks like this is your first PR to kubernetes/website 🎉. Please refer to our pull request process documentation to help your PR have a smooth ride to approval.

You will be prompted by a bot to use commands during the review process. Do not be afraid to follow the prompts! It is okay to experiment. Here is the bot commands documentation.

You can also check if kubernetes/website has its own contribution guidelines.

You may want to refer to our testing guide if you run into trouble with your tests not passing.

If you are having difficulty getting your pull request seen, please follow the recommended escalation practices. Also, for tips and tricks in the contribution process you may want to read the Kubernetes contributor cheat sheet. We want to make sure your contribution gets all the attention it needs!

Thank you, and welcome to Kubernetes. 😃

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by:
Once this PR has been reviewed and has the lgtm label, please assign tengqm for approval. For more information see the Code Review Process.

The full list of commands accepted by this bot can be found here.

Details

Needs approval from an approver in each of these files:

• content/en/docs/OWNERS

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[netlify]

✅ Pull request preview available for checking

Built without sensitive environment variables

Name	Link
🔨 Latest commit	c2fd268
🔍 Latest deploy log	https://app.netlify.com/projects/kubernetes-io-main-staging/deploys/69d469156e91bc0008dedb13
😎 Deploy Preview	https://deploy-preview-55278--kubernetes-io-main-staging.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify project configuration.

[lmktfy]

Is this a duplicate of #55026?