feat: add support for templated clusterName

[iamKunal]

Issue

Allows templating of clusterName. This is similar to https://github.com/DataDog/helm-charts/pull/1324 and solves the same purpose.

Description

We're deploying the chart using ArgoCD and ApplicationSets with a cluster generator. To avoid having to bake alb-specific logic into our wider ArgoCD Application generator, we need support for rendering clusterName as a template variable in order to generate an appropriate value from generic values.

Checklist

• [ ] Added tests that cover your change (if possible)
• [ ] Added/modified documentation as required (such as the README.md, or the docs directory)
• [x] Manually tested
• [x] Made sure the title of the PR is a good description that can go into the release notes

BONUS POINTS checklist: complete for good vibes and maybe prizes?! :exploding_head:

• [ ] Backfilled missing tests for code in same general area :tada:
• [ ] Refactored something and made the world a better place :star2:

[linux-foundation-easycla[bot]]

• :white_check_mark:login: iamKunal / (d82b91208bed65f036a98567ab45a32d136075cd)

The committers listed above are authorized under a signed CLA.

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[k8s-ci-robot]

Hi @iamKunal. Thanks for your PR.

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[APPROVALNOTIFIER] This PR is NOT APPROVED

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

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PR needs rebase.

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[oliviassss]

@iamKunal, hey sorry for the delay would this commit work for your use case? we have shipped in helm chart version v1.8.0 https://github.com/kubernetes-sigs/aws-load-balancer-controller/pull/3664

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