feat: pre-messages / next version of download on demand (#7371)

Closes <https://github.com/chatmail/core/issues/7367>

Co-authored-by: iequidoo <dgreshilov@gmail.com>
Co-authored-by: Hocuri <hocuri@gmx.de>

src/context/context_tests.rs

@@ -297,6 +297,7 @@ async fn test_get_info_completeness() {
         "encrypted_device_token",
         "stats_last_update",
         "stats_last_old_contact_id",
+        "simulate_receive_imf_error", // only used in tests
     ];
     let t = TestContext::new().await;
     let info = t.get_info().await.unwrap();