Refactor and fixes dropdown bugs (#8807)

Fixes https://github.com/twentyhq/twenty/issues/8788
Fixes https://github.com/twentyhq/twenty/issues/8793
Fixes https://github.com/twentyhq/twenty/issues/8791
Fixes https://github.com/twentyhq/twenty/issues/8890
Fixes https://github.com/twentyhq/twenty/issues/8893

- [x] Also : 

Icon buttons under dropdown are visible without blur : 

![Capture d’écran du 2024-11-29
15-09-53](https://github.com/user-attachments/assets/f563333d-4e43-4ded-acc7-62e116004ed9)

- [x] Also : 

<img width="237" alt="image"
src="https://github.com/user-attachments/assets/e4c70936-beff-4481-89cb-0a32a36e0ee2">

- [x] Also : 

<img width="335" alt="image"
src="https://github.com/user-attachments/assets/5be60395-6baf-49eb-8d40-197add049e20">

- [x] Also : 

<img width="287" alt="image"
src="https://github.com/user-attachments/assets/a317561f-7986-4d70-a1c0-deee4f4e268a">

- Button create new without padding
- Container is expanding

- [x] Also : 

<img width="303" alt="image"
src="https://github.com/user-attachments/assets/09f8a27f-91db-4191-acdc-aaaeedaf6da5">

- [x] Also : 

<img width="133" alt="image"
src="https://github.com/user-attachments/assets/fe17b32e-f7a4-46c4-8040-239eaf8198e8">

Font is cut at bottom ?

- [x] Also : 

<img width="385" alt="image"
src="https://github.com/user-attachments/assets/7bab2092-2936-4112-a2ee-d32d6737e304">

The component should flip and not resize in this situation

- [x] Also : 

<img width="244" alt="image"
src="https://github.com/user-attachments/assets/5384f49a-71f9-4638-a60c-158cc8c83f81">

- [x] Also : 


![image](https://github.com/user-attachments/assets/9cd1f43a-df59-401e-9a41-bdb8e93ebe58)

packages/twenty-ui/src/testing/utils/getCanvasElementForDropdownTesting.ts

@@ -0,0 +1,15 @@
+import { isDefined } from '@ui/utilities';
+
+export const getCanvasElementForDropdownTesting = () => {
+  const canvasElement = document.getElementsByClassName(
+    'sb-show-main',
+  )[0] as HTMLElement | null;
+
+  if (!isDefined(canvasElement)) {
+    throw new Error(
+      `Canvas element not found for dropdown testing in storybook, verify that storybook still uses the class name "sb-show-main" for its body that displays stories.`,
+    );
+  }
+
+  return canvasElement;
+};