This PR presents an attempt to increase the speed of the tests to run,
by using the same front-end built for Front and E2E CIs. It implied
merging front and E2E in one CI, but allowed to still have two different
status, and to have E2E run even if no front files have changed.
Also now using depot to build FE.
<img width="270" height="546" alt="image"
src="https://github.com/user-attachments/assets/d9eccc62-4494-4102-ad4e-241fec4bd4ea"
/>
