[REFACTOR] Twenty UI multi barrel (#11301)

# Introduction
closes https://github.com/twentyhq/core-team-issues/issues/591
Same than for `twenty-shared` made in
https://github.com/twentyhq/twenty/pull/11083.

## TODO
- [x] Manual migrate twenty-website twenty-ui imports

## What's next:
- Generate barrel and migration script factorization within own package
+ tests
- Refactoring using preconstruct ? TimeBox
- Lint circular dependencies
- Lint import from barrel and forbid them

### Preconstruct
We need custom rollup plugins addition, but preconstruct does not expose
its rollup configuration. It might be possible to handle this using the
babel overrides. But was a big tunnel.
We could give it a try afterwards ! ( allowing cjs interop and stuff
like that )
Stuck to vite lib app

Closed related PRs:
- https://github.com/twentyhq/twenty/pull/11294
- https://github.com/twentyhq/twenty/pull/11203

packages/twenty-ui/src/assets/icons/gmail.svg

@@ -0,0 +1,7 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="14" height="12" fill="none" viewBox="0 0 14 12">
+  <path fill="#4285F4" d="M.955 11.252h2.227v-5.41L0 3.456v6.841c0 .528.428.954.955.954Z"/>
+  <path fill="#34A853" d="M10.818 11.252h2.227a.954.954 0 0 0 .955-.955V3.456l-3.182 2.386"/>
+  <path fill="#FBBC04" d="M10.818 1.706v4.136L14 3.456V2.183c0-1.18-1.348-1.853-2.291-1.145"/>
+  <path fill="#EA4335" d="M3.182 5.842V1.706L7 4.57l3.818-2.864v4.136L7 8.706"/>
+  <path fill="#C5221F" d="M0 2.183v1.273l3.182 2.386V1.706l-.891-.668C1.346.33 0 1.003 0 2.183Z"/>
+</svg>