chore(kustomize): remove admin secret

As the default provider is token-based and designed to be self-serviced
for Openshift identities, the admin secret is no longer used.

This can be safely removed from the base manifests.

Signed-off-by: Bartosz Majsak <bartosz.majsak@gmail.com>

Author: bartoszmajsak

deployment/base/maas-api/admin-secret.yaml

@@ -8,7 +8,6 @@ resources:
   - deployment.yaml
   - token-rate-limit-policy.yaml
   - service.yaml
-  - admin-secret.yaml
   - httproute.yaml
   - auth-override.yaml
   - tier-mapping-configmap.yaml