Modify extractCompasPrivate method to respect good developpement practices

[gleizesDor]

org.lfenergy.compas.sct.commons.scl.PrivateService#extractCompasPrivate(org.lfenergy.compas.scl2007b4.model.TBaseElement, java.lang.Class)

This method as a simple goal : filter a list to return the matching element
So there is no need to create :
2 private methods
2 separated lists
etc...

An exemple would be :

private TCompasICDHeader gettCompasICDHeader(TIED tied) {
        return tied.getPrivate()
                .stream()
                .filter(tPrivate -> "COMPAS-ICDHeader".equals(tPrivate.getType()))
                .map(TAnyContentFromOtherNamespace::getContent)
                .flatMap(Collection::stream)
                .filter(JAXBElement.class::isInstance)
                .map(JAXBElement.class::cast)
                .map(JAXBElement::getValue)
                .map(TCompasICDHeader.class::cast)
                .findFirst()
                .orElseThrow();
    }