SSO settings page: resolve plan before the role check. A non-Enterprise
org now renders the upsell state for every role instead of showing a
"permission denied" panel to non-Owners for a feature their org can't
use yet. manage:sso is only enforced once the org is actually entitled.
Extracts EMPTY_SSO_STATUS and uses throwPermissionDenied().
Also removes the client-side SSO session fetch guard. It monkeypatched
global window.fetch, which made it the initiator of every request and
obfuscated the real call site on any 4xx/5xx. Session revocation is
still enforced server-side on every authenticated request and surfaces
as a logout redirect on the next navigation/refresh, so the client guard
was UX-only and not worth the cross-cutting cost.
Oskar Otwinowski