feat(button): apply default type set to `button` when not present on the button

[Supamiu]

trafficstars

Description

As described in #2739, this won't override already present type (like submit for instance) and won't be applied to <a luButton> tags, only <button luButton> ones.

---

closes #2739

---

[LuccaIntegration]

:woman_cook: https://lucca-front.lucca.tech/PR-2775/storybook

[CCNET-iLucca]

Tests d'interfaces