Babel presets 'next/babel' and '@adeira/babel-preset-adeira' cannot be used together

[mrtnzlml]

This is a follow-up after these PRs/issues:

• 1c5d0b4
• Remove 'next/babel' preset #1805

Basically, we have issues using these two presets together (for example, crashing on Missing class properties transform when running yarn workspaces @adeira/example-relay test-bc and with the explicit @babel/plugin-proposal-class-properties we cannot write declare in our JS code).

This possibly requires creating a small reproducible code and getting in touch with Next.js team to figure out what do to.