efl: ensure legacy is only relying on stable types
This commit changes the beta ness of a few types, those types are
looking quite stable. Edje types will likely not change. The
Efl.Gfx.Join types are actaully already stable since the last release,
since evas_vg was stable back then and those enums have been in there.
The elementary stuff looks a bit unthought, and we have the chance to
change the API in the backend, so maybe we want to not declare it
stable, but rather reintroduce the legacy types.
With this we can enable eolian generation of beta tags for types.
Depends on D8276
Reviewers: cedric, segfaultxavi, zmike, stefan_schmidt, q66
Reviewed By: segfaultxavi, q66
Maniphest Tasks: T7726
Differential Revision: https://phab.enlightenment.org/D8277