Remove addon argocd

[VannTen]

What type of PR is this?
/kind api-change

What this PR does / why we need it:
See discussion in linked issue

Which issue(s) this PR fixes:

Closes #10846

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

Argocd addon handling is removed.
action required: handle Argocd by other means

/hold
(that's just a provisional PR if we decide to remove it)

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[APPROVALNOTIFIER] This PR is NOT APPROVED

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[mzaian]

Hello @VannTen

I know that some of our users are using the ArgoCD add-on from our code. I believe we cannot get the numbers about how many are using it. So let's keep it and try to maintain it.

[k8s-ci-robot]

PR needs rebase.

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/lifecycle stale

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/lifecycle rotten

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/close

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@k8s-triage-robot: Closed this PR.

In response to this:

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/close

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