Fix CPPCheck issues - non-explicit constructors

[eljonny]

Per the standard, these should be marked as explicit.

/github/workspace/include/TestCPP.h:62:9: style: Class 'TestCPPException' has a constructor with 1 argument that is not explicit. [noExplicitConstructor]
/github/workspace/include/TestCPP.h:63:9: style: Class 'TestCPPException' has a constructor with 1 argument that is not explicit. [noExplicitConstructor]
/github/workspace/include/TestCPP.h:68:9: style: Class 'TestFailedException' has a constructor with 1 argument that is not explicit. [noExplicitConstructor]
/github/workspace/include/TestCPP.h:69:9: style: Class 'TestFailedException' has a constructor with 1 argument that is not explicit. [noExplicitConstructor]
/github/workspace/include/TestCPP.h:75:9: style: Class 'TestCaseName' has a constructor with 1 argument that is not explicit. [noExplicitConstructor]

[eljonny]

Updated after the refactor:

/github/workspace/include/internal/TestCPPExceptions.h:63:9: style: Class 'TestCPPException' has a constructor with 1 argument that is not explicit. [noExplicitConstructor]
/github/workspace/include/internal/TestCPPExceptions.h:69:9: style: Class 'TestCPPException' has a constructor with 1 argument that is not explicit. [noExplicitConstructor]
/github/workspace/include/internal/TestCPPExceptions.h:92:9: style: Class 'TestFailedException' has a constructor with 1 argument that is not explicit. [noExplicitConstructor]
/github/workspace/include/internal/TestCPPExceptions.h:98:9: style: Class 'TestFailedException' has a constructor with 1 argument that is not explicit. [noExplicitConstructor]
/github/workspace/include/internal/TestCPPUtil.h:68:9: style: Class 'TestObjName' has a constructor with 1 argument that is not explicit. [noExplicitConstructor]