feature: add ha overlay for seaweedfs

[pschoen-itsc]

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[juliusvonkohout]

That will be removed in #12387

[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