Re-enable Ceph dashboard SSL to fix SAML http/https URL mismatch

X-Forwarded-Proto approach didn't work - Ceph dashboard SAML doesn't
read it. Re-enabling native SSL so the dashboard sees https:// URLs
directly. Updated both Istio and Envoy Gateway backends for TLS with
insecureSkipVerify for the self-signed cert.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

infrastructure/rook-ceph/manifests/istio-virtualservice.yaml

@@ -9,13 +9,9 @@ spec:
   gateways:
     - istio-system/edge
   http:
-    - headers:
-        request:
-          set:
-            x-forwarded-proto: https
-      timeout: 3600s
+    - timeout: 3600s
       route:
         - destination:
             host: rook-ceph-mgr-dashboard.rook-ceph.svc.cluster.local
             port:
-              number: 7000
+              number: 8443