Fix assert_eq! argument order in metrics tests

The assert_eq! macro arguments were swapped relative to the error message
template. Fixed by swapping 'Expected' and 'Actual' labels in the error
message to match the actual order of arguments (actual, expected).

Signed-off-by: Keiven Chang <keivenchang@users.noreply.github.com>

Author: keivenchang

lib/runtime/src/metrics.rs

@@ -1214,10 +1214,10 @@ dynamo_component_testcounter{dynamo_component="comp345",dynamo_endpoint="ep345",
         assert_eq!(
             endpoint_output_raw, expected_endpoint_output,
             "\n=== ENDPOINT COMPARISON FAILED ===\n\
-             Expected:\n{}\n\
              Actual:\n{}\n\
+             Expected:\n{}\n\
              ==============================",
-            expected_endpoint_output, endpoint_output_raw
+            endpoint_output_raw, expected_endpoint_output
         );
 
         // Test Gauge creation
@@ -1243,10 +1243,10 @@ dynamo_component_testgauge{dynamo_component="comp345",dynamo_namespace="ns345"}
         assert_eq!(
             component_output_raw, expected_component_output,
             "\n=== COMPONENT COMPARISON FAILED ===\n\
-             Expected:\n{}\n\
              Actual:\n{}\n\
+             Expected:\n{}\n\
              ==============================",
-            expected_component_output, component_output_raw
+            component_output_raw, expected_component_output
         );
 
         let intcounter = namespace
@@ -1274,10 +1274,10 @@ dynamo_component_testintcounter{dynamo_namespace="ns345"} 12345"#.to_string();
         assert_eq!(
             namespace_output_raw, expected_namespace_output,
             "\n=== NAMESPACE COMPARISON FAILED ===\n\
-             Expected:\n{}\n\
              Actual:\n{}\n\
+             Expected:\n{}\n\
              ==============================",
-            expected_namespace_output, namespace_output_raw
+            namespace_output_raw, expected_namespace_output
         );
 
         // Test IntGauge creation