Determine whether to remove subcomponents from meta

[yannbf]

It's unclear whether to remove subcomponents from Meta in Storybook 8:

storybook/code/lib/types/src/modules/addons.ts

Line 296 in 975ad76

subcomponents?: Record<string, ComponentType>;

@JReinhold @shilman please let us know whenever you can, and what can be done migration-wise 🙏

[shilman]

I think we should keep these & figure out in 9.0. WDYT @JReinhold ?

[JReinhold]

We'll keep this around, and maybe even revert the deprecation altogether if time allows it.