test: assert real behavior in three assertion-less tests (#5993)

test_format_v1 (ecstore layout::format) only printed its results; the pinned v1 format.json literal never parsed at all because "this": null fails Uuid deserialization, and the Err was silently discarded. Fix the fixture to the real on-disk shape (MinIO and RustFS always write a concrete disk UUID there) and assert a serialize->parse roundtrip identity plus every pinned field of the literal.

test_console_cors_configuration discarded all four parse_cors_origins results; parse_cors_origins returns an opaque CorsLayer, so the test now drives real CORS preflight requests through an axum router and asserts the allow-origin outcomes: wildcard answers any origin with *, a configured list echoes listed origins and refuses unlisted ones, empty/unset configurations allow no cross-origin caller.

test_heal_channel_processor_new only constructed the processor; it now asserts the response channel accepts a send.

Ref rustfs/backlog#1836 (PR1).

crates/heal/src/heal/channel.rs

@@ -785,9 +785,15 @@ mod tests {
         let heal_manager = create_test_heal_manager();
         let processor = HealChannelProcessor::new(heal_manager);
 
-        // Verify processor is created successfully
-        let _sender = processor.get_response_sender();
-        // If we can get the sender, processor was created correctly
+        let sender = processor.get_response_sender();
+        sender
+            .send(HealChannelResponse {
+                request_id: "request-id".to_string(),
+                success: true,
+                data: None,
+                error: None,
+            })
+            .expect("a freshly constructed processor must accept responses on its channel");
     }
 
     #[test]