Hard-coded Lunatic labels types

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 (https://github.com/InseeFr/Lunatic-Model/issues/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](https://github.com/InseeFr/Eno/blob/ff20824a2fe7229226468227cdceb10ec09beb30/src/main/resources/xslt/transformations/ddi2lunatic-xml/ddi2lunatic-xml-fixed.xsl#L739) sheet in V2
- in mapping annotations in V3 (https://github.com/InseeFr/Eno/commit/7cb8374a98392661f731a3fce5834ea5978d0438)

This should rather be done either with metadata, or maybe be fixed by [Lunatic-Model](https://github.com/InseeFr/Lunatic-Model). The value of Lunatic label types should not be determined by Eno.