........S. [ZBXNEXT-8682] added cmocka tests in preprocessing for backslash testing and fixed unique case with snmp item tests
* commit '1454bc0b4fced9c66f67b1e8207d0a20dcc7262a':
........S. [ZBXNEXT-8682] fixed unique case with snmp item tests as it does not send item key
.......... [ZBXNEXT-8682] added cmocka tests in preprocessing for backslash testing
