iox-eclipse-iceoryx#2301 Clear caches log entries from testing logger…

… once the cache is printed to the terminal

iceoryx_hoofs/testing/testing_logger.cpp

@@ -83,6 +83,7 @@ void TestingLogger::printLogBuffer() noexcept
         puts(log.c_str());
     }
     puts("#### Log end ####");
+    loggerData->buffer.clear();
 }
 
 uint64_t TestingLogger::getNumberOfLogMessages() noexcept