feat: fix abtestui overlay

[kamilkifer]

What ⁉️

• fix the AB test ui.
  • problem caused by the app launching BEFORE the user config was loaded, leading to it being initialised with default config values.

Why ⁉️

• To make it slightly easier to preview various variations of A/B tests.

How ⁉️

• npm link skift into wrapper

• npm link wrapper into relevant app

• slowly but surely, using the debugger.

• The issue was that the app was running the shouldShowUI() call, before the user config was passed in.

• currently handled by the configLoaded variable.

How to review and test 📱

• npm link as mentioned above.

Extra info

• More problems spawned from the GHA
  • Initially, the linter was complaining, and the cause was import type
  • After some research, type-only imports were introduced in TS 3.8
• Upgrading caused further compatibility problems.
• I've updated a few packages, which causes other compatibility errors to appear, and lead to more package upgrades.
• Eventually got it all working locally (via npm link), with tests passing and building properly.

Checklist ✅

• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing tests are passing locally