All tasks tagged as growthexperiments-* are also related to GrowthExperiments by definition, they're subfeatures defined in the GrowthExperiments repository.
@Catrope suggested setting the projects as subprojects of GrowthExperiments.
- GrowthExperiments-Help panel
Tagging as Diffusion-Repository-Administrators, since they have the power to edit H26 and other global herald rules, and Project-Admins, to judge if we want to sub-project them.
CCing @JTannerWMF, since she created the projects IIRC.