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Admin access for let_admins, viewer and training for let_alle

Dex deployment has a bug, init container lacks behind the switch to `argocd-dex` tool.
Main container needs it, but init container still prepares the old tool:

https://github.com/argoproj/argo-cd/blob/master/docs/operator-manual/upgrading/1.8-1.9.md#dex-tool-migrated-from-argocd-util-to-argocd-dex