📌 load pinboard for V2 fronts tool if user has Pinboard permission

[twrichards]

What's changed?

This integrates https://github.com/guardian/pinboard in its current form, assuming the user has Pinboard permission. This is just the initial integration phase, and hopefully some additional/deeper integrations will follow (mostly on the pinboard side most likely).

Implementation notes

Checklist

General

• [ ] 🤖 Relevant tests added
• [x] ✅ CI checks / tests run locally
• [x] 🔍 Checked on CODE

Client

• [ ] 🚫 No obvious console errors on the client (i.e. React dev mode errors)
• [ ] 🎛️ No regressions with existing user interactions (i.e. all existing buttons, inputs etc. work)
• [x] 📷 Screenshots / GIFs of relevant UI changes included