fix: Do not show actively disabled auth providers in self-hosted install (#4794)

* fix: Do not show actively disabled auth providers in self-hosted installation

* self review

* Refactor for easier mocking

server/commands/teamProvisioner.ts

@@ -72,7 +72,7 @@ async function teamProvisioner({
     };
   } else if (teamId) {
     // The user is attempting to log into a team with an unfamiliar SSO provider
-    if (env.DEPLOYMENT === "hosted") {
+    if (env.isCloudHosted()) {
       throw InvalidAuthenticationError();
     }