fix(NcUserBubble): indicate that element is clickable

[Antreesy]

☑️ Resolves

• Show interactive cursor pointer if an element has click event or a content to show in Popover

RFC:

Isn't &--clickable * too wide? I doubt anyone is planning to insert an input in name slot, but still

🖼️ Screenshots

🏚️ Before	🏡 After

🏁 Checklist

• [ ] ⛑️ Tests are included or are not applicable
• [x] 📘 Component documentation has been extended, updated or is not applicable
• [ ] 3️⃣ Backport to next requested with a Vue 3 upgrade

[Antreesy]

here NcUserBubble is used as a clickable div

Without additional context (spreed PR), clickable div itself should be already an issue. Maybe we should extend it to <a>/<button>/<div> at least?

[ShGKme]

here NcUserBubble is used as a clickable div

Without additional context (spreed PR), clickable div itself should be already an issue. Maybe we should extend it to <a>/<button>/<div> at least?

Component already supports <a> with href prop. We can also add to prop to support <RouterLink>.

With Popover it is still clickable <div>, but let's call it a separate issue

[Antreesy]

/backport to next