Convert all apps in 'aaa' to use ExternalSecret CRDs instead of normal K8s Secrets where applicable

[spiffxp]

ref: #2078 (comment)

By "where applicable" I mean if humans are at all involved in provisioning the secret. I'm going to guess any Secret in aaa that is of type Opaque falls under this category

$ k get secrets --context=aaa -A | grep -v kube-system | grep Opaque
cert-manager                  letencrypt-prod-account-key                      Opaque                                1      579d
cert-manager                  letencrypt-staging-account-key                   Opaque                                1      579d
publishing-bot                github-token                                     Opaque                                1      396d
slack-infra                   recaptcha                                        Opaque                                2      396d
slack-infra                   slack-event-log-config                           Opaque                                1      396d
slack-infra                   slack-moderator-config                           Opaque                                1      396d
slack-infra                   slack-moderator-words-config                     Opaque                                1      60d
slack-infra                   slack-post-message-config                        Opaque                                1      257d
slack-infra                   slack-welcomer-config                            Opaque                                1      396d
slack-infra                   slackin-token                                    Opaque                                1      396d
triageparty-release           triage-party-github-token                        Opaque                                1      21d

So...

• cert-manager (though maybe moot, I think we're trying to move to GKE-managed certs ref: Consider using Google-managed SSL certificates for aaa #1943)
• publishing-bot
• slack-infra
• triageparty-release (which I believe @ameukam has already done)

/wg k8s-infra
/area cluster-mgmt
/kind cleanup
/milestone v1.22
/priority important-soon

[spiffxp]

/close
I'm closing this in favor of #2220 which covers this more extensively

[k8s-ci-robot]

@spiffxp: Closing this issue.

In response to this:

/close
I'm closing this in favor of #2220 which covers this more extensively

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