Provide replacement attribute for deprecated XPath attributes

[adangel]

With pmd/pmd#4809 the method Attribute#replacementIfDeprecated() of a XPath attribute has been internalized.

Previously the Designer used this to display the info, what should be used instead.
Now, it will only display, that the attribute is deprecated, but no further info.

Ideally the designer would display the javadoc of the attributes... then we don't need this method as the public API.

With PMD 7.0.0, there won't be any deprecated attributes for the beginning, so it's not a blocker that this method is gone.