KES: Migrate to SecretStore from ExternalSecret

[ameukam]

Kubernetes External Secrets has entered maintenance mode and is recommended to move to a new External Secrets Operator.

We should do the migration when tooling dedicated to the migration is available.

Ref : https://github.com/external-secrets/kes-to-eso

/kind feature
/sig testing
/priority backlog
/milestone v1.26

[knelasevero]

Let us know if we can help somehow!

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/lifecycle stale

[ameukam]

/remove-lifecycle stale
/lifecycle frozen