feature: add ha overlay for seaweedfs

[pschoen-itsc]

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[google-oss-prow]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

[juliusvonkohout]

As a first feedback we need to make sure that the single pod deployment stays the default and you need to rebase (not merge) to master.

[juliusvonkohout]

/ok-to-test

[juliusvonkohout]

CC @akagami-harsh for feedback

[juliusvonkohout]

And please test directly with 4.0.0 as in #12406

[juliusvonkohout]

https://artifacthub.io/packages/helm/bitnami/seaweedfs/4.0.0 and even more https://github.com/seaweedfs/seaweedfs/tree/master/k8s/charts/seaweedfs might be a good comparision

[google-oss-prow]

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[pschoen-itsc]

@juliusvonkohout The kind cluster for the tests is a single node cluster, right? So should I add a kind config to always create a three node cluster? Or something more complex to only do that when testing the HA setup?