Variants : Documentation's Radio buttons are broken in dev environment due to inverted theme displayed

[Ldoppea]

In dev environment, both normal and inverted themes are displayed by creating a duplicate of the normal samples.

This breaks variants' radio buttons because their name is not unique anymore and then normal samples and inverted ones share the same Radio context.

Here is a video showing the problem:

https://user-images.githubusercontent.com/1884255/133463323-f0a1a5b2-ddc2-4764-bbfa-f45e60df52b4.mp4

It is possible to counter this effect by adding a guid to those names like in this PR, but for variants this may be laborious : https://github.com/cozy/cozy-ui/pull/1902/files#diff-e640647029fda9aa6b0efe6a7c5f3ae65e65bbab85e0bc979a1aa635675681e0R66-R101

[Ldoppea]

cc @JF-Cozy this is a side effect of https://github.com/cozy/cozy-ui/pull/1856