fix(NcButton): re-export types

[ShGKme]

☑️ Resolves

• Fix Type export path is broken on vue 9.0.0-rc0 #6870

🏁 Checklist

• ⛑️ Tests are included or are not applicable
• 📘 Component documentation has been extended, updated or is not applicable
• 2️⃣ Backport to stable8 for maintained Vue 2 version or not applicable

[susnux]

Affects much more components.
Either fix all manually or we deprecate using the main import in general and simply do not export types there so you only import

import type { ButtonVariant } from '@nextcloud/vue/components/NcButton'

[ShGKme]

Affects much more components

This is the only component with type export

[ShGKme]

@skjnldsv Does it work for you?
I am unsure this is the problem you had :)

[ShGKme]

@skjnldsv ?

[skjnldsv]

I stopped using the type, cannot tell 🙈

[susnux]

converted to draft until we decided if this is the way we want it to be, ref:
#6870 (comment)

[susnux]

Reopen if we decide the other way around but otherwise lets keep types in component entry points