Tests for emitted events with defineModel

[ExEr7um]

• Made some tests for Emitted events doesn't work with defineModel nuxt/test-utils#572
• Activated defineModel in Nuxt config

This pull request could be the starting point for fixing the issue.

[Seboran]

I've been trying to solve this PR for quiet a while now... But to no success

What I've found is that, a defineModel uses the currentInstance method in https://github.com/vuejs/core/blob/b775b71c788499ec7ee58bc2cf4cd04ed388e072/packages/runtime-core/src/apiSetupHelpers.ts#L356 and every event will be emitted from this instance through it's uid

But this instance does not correspond to component we are trying to mount, and I don't know where it comes from.

I'm not sure how we can solve this... The only hack I've found is to manually set the vm.vm.$.uid of the wrapper to 16 (the one from which the event is emitted...). But I still don't really understand where it comes from.