Changes:
- Enable adminUser creation but disable Helm-managed secret
- Use ExternalSecret (cluster-user-auth) from Doppler instead
- Doppler secrets: WEAVE_GITOPS_ADMIN_USERNAME and WEAVE_GITOPS_ADMIN_PASSWORD_BCRYPT_HASH
- Added cluster-user-auth to viewSecretsResourceNames for RBAC
Login credentials are now managed via Doppler and External Secrets Operator.