[Matter.framework] Do not delete the file containing the log data onc…

…e the downloadLogOfType completion is done

src/darwin/Framework/CHIP/MTRBaseDevice.h

@@ -547,9 +547,6 @@ MTR_AVAILABLE(ios(16.1), macos(13.0), watchos(9.1), tvos(16.1))
 /**
  * Download log of the desired type from the device.
  *
- * Note: The consumer of this API should move the file that the url points to or open it for reading before the
- * completion handler returns. Otherwise, the file will be deleted, and the data will be lost.
- *
  * @param type       The type of log being requested. This should correspond to a value in the enum MTRDiagnosticLogType.
  * @param timeout    The timeout for getting the log. If the timeout expires, completion will be called with whatever
  *                   has been retrieved by that point (which might be none or a partial log).

src/darwin/Framework/CHIP/MTRDiagnosticLogsDownloader.mm

@@ -165,7 +165,6 @@ - (instancetype)initWithType:(MTRDiagnosticLogType)type
                     // data in the logs that the caller may find useful. For this reason, fileURL is passed in even
                     // when there is an error but fileHandle is not nil.
                     completion(strongSelf->_fileHandle ? fileURL : nil, bdxError);
-                    [strongSelf deleteFile];
 
                     done(strongSelf);
                 }