fix: update stale blast-radius test assertion for active_runtime_use

The createDeleteBlastRadius helper now includes 'active_runtime_use' in
deleteBlockedReasons when hasActiveRuntimeUse is true. The existing
blast-radius test for instance admins passed activeLeaseCount: 1, so
the helper produces canDelete: false / deleteBlockedReasons: ['active_runtime_use'],
but the assertion still expected the old canDelete: true / deleteBlockedReasons: [].

Co-Authored-By: Paperclip <noreply@paperclip.ing>

server/src/__tests__/environment-routes.test.ts

@@ -422,8 +422,8 @@ describe("environment routes", () => {
     expect(res.status).toBe(200);
     expect(res.body).toEqual({
       environmentId: "env-1",
-      canDelete: true,
-      deleteBlockedReasons: [],
+      canDelete: false,
+      deleteBlockedReasons: ["active_runtime_use"],
       staticReferences: {
         isManagedLocal: false,
         isInstanceDefault: false,