fix(tests): handle mutex lock gracefully to prevent poisoning

Use if let Ok() pattern instead of unwrap() on mutex locks in test
output handlers to prevent cascade failures when tests run in parallel.

Author: 1313

tests/integration_tests.rs

@@ -25,7 +25,9 @@ impl SCStreamOutputTrait for VideoTestOutput {
         sample_buffer: CMSampleBuffer,
         _of_type: SCStreamOutputType,
     ) {
-        self.samples.lock().unwrap().push(sample_buffer);
+        if let Ok(mut guard) = self.samples.lock() {
+            guard.push(sample_buffer);
+        }
     }
 }
 
@@ -40,7 +42,9 @@ impl SCStreamOutputTrait for AudioTestOutput {
         sample_buffer: CMSampleBuffer,
         _of_type: SCStreamOutputType,
     ) {
-        self.samples.lock().unwrap().push(sample_buffer);
+        if let Ok(mut guard) = self.samples.lock() {
+            guard.push(sample_buffer);
+        }
     }
 }