grails-core groovydoc duplication for grails-data

### Issue description

If we remove the extra groovydocs from grails-data they would need to be done as part of https://github.com/apache/grails-core/issues/14990

/api/ has groovydocs for everything in grails-core including grails-data.

Duplicated Groovydocs for grails-data exist in the combined /api/ and a second location:

grails-data/api
grails-data/hibernate5/api
grails-data/mongodb/api

https://docs.grails.org/snapshot/api/
https://docs.grails.org/snapshot/grails-data/api/
https://docs.grails.org/snapshot/grails-data/hibernate5/api/
https://docs.grails.org/snapshot/grails-data/mongodb/api/

everything else, which was consolidated into grails core, only exists in /api/.

`grails-gradle` and `grails-forge`, are separate Gradle projects are not included. https://github.com/apache/grails-core/issues/14978 & https://github.com/apache/grails-core/issues/14996

Start by reading issue #14990 and comparing the documented paths under /api/, grails-data/api, grails-data/hibernate5/api, and grails-data/mongodb/api. Verify how the Groovydoc output is generated, then confirm that grails-data appears only in the consolidated /api/ while grails-gradle and grails-forge remain excluded.

Written by the indexing model from the issue text.