refactor: remove commented code (SonarQube defect fix)

[zielint0]

• PR fixes some SonarQube violations: This block of commented-out lines of code should be removed.
• Remove not thrown exceptions in test - VariableReferencesTest.java
• Fix formatting

Substitution.java
I paid attention not to remove:

//if (!f.getSimpleName().equals("_" + f.getAnnotation(Parameter.class).value())) {
//	throw new TemplateException("the field name of a proxy template parameter must be called _" + f.getSimpleName());
//}

CtRolePathElement.java (line 112)
//No element found for name.
Is this commented needed?

I am ready to merge.

[zielint0]

@surli
What is pull_request-INRIA-spoon-newtestcheck — [INFO] BUILD SUCCESS and why it happens from time to time? (not always?)