Add argocd.argoproj.io/compare-options: IgnoreExtraneous annotation to
both Stalwart sealed secret templates (stalwart-admin-credentials and
stalwart-s3-backup) to prevent ArgoCD from seeing the unsealed secrets
(created by sealed-secrets controller) as extraneous.
This is the same fix applied in DEV-377 (Directus) and DEV-378 (Harbor).
Resolves: DEV-379
Co-Authored-By: Paperclip <noreply@paperclip.ing>