[TA75] add positive standalone test case for Relation syntax verification
[TA75] add positive inheritance test case for relation syntax verification
[TA75][TA76][TA126]Add Test cases for following three errors

1. TA75 Relation attribute  of @InboundWhile not valid
2. TA126 @RelateTo not refer to a stateMachine
3. TA76 @InboundWhile.on not valid