Fix storybook / chromatic tests flakyness and integration tests (#11687)

## Storybook flakyness

### Actor Display image flakyness

<img width="1512" alt="image"
src="https://github.com/user-attachments/assets/875c0738-5e31-4aba-9231-4ba5f78d1355"
/>

**Fix:** stop using a random usage

### Task Groups broken

<img width="1512" alt="image"
src="https://github.com/user-attachments/assets/c67e47a1-a027-43f1-9601-68d61a8052b4"
/>

**Fix:** add missing TabListComponentInstance

## Flaky dates

Add https://github.com/k35o/storybook-addon-mock-date

## Integration tests

Fix broken tests due to relation refactoring

packages/twenty-front/.storybook/main.ts

@@ -48,6 +48,7 @@ const config: StorybookConfig = {
     'storybook-dark-mode',
     'storybook-addon-cookie',
     'storybook-addon-pseudo-states',
+    'storybook-addon-mock-date'
   ],
   framework: {
     name: '@storybook/react-vite',