Hard-coded Lunatic labels types

[nsenave]

Lunatic model has introduced complex label objects which have a String value (that corresponds to previous label modeling), and a type. This type is currently a String that should be better modeled later on (InseeFr/Lunatic-Model#72), but it is not the purpose of this issue.

The value of these label types is hard-coded in Eno:

• in ddi2lunatic-xml-fixed.xsl sheet in V2
• in mapping annotations in V3 (7cb8374)

This should rather be done either with metadata, or maybe be fixed by Lunatic-Model. The value of Lunatic label types should not be determined by Eno.