[DataGrid] Fix type definitions

[tooppaaa]

Closes #573

What I did:

• Prevent *.test.* to go through types generation
• Help createSelector to find its right typings

[oliviertassinari]

In the future, we have two solutions:

1. add a step in the CI to guarantee that the types are correct
2. migrate to the main repository build approach, we never had this type of problem

I think that there is a high level of chance that we will be hit by this problem again in the future if we don't do any of 1. or 2. Time will tell

[oliviertassinari]

@tooppaaa in case you need to use this patch now, you can use the version published to codesandbox ci.

[tooppaaa]

@oliviertassinari oh thanks ! I didn't noticed that. Will do !

Happy to help on adding tests for the CI. I had some thoughts but no brillant idea here.