Serverless function UI (#6388)

https://www.figma.com/design/xt8O9mFeLl46C5InWwoMrN/Twenty?node-id=36235-120877

Did not do the file manager part. A Function is defined using one unique
file at the moment

Feature protected by featureFlag `IS_FUNCTION_SETTINGS_ENABLED`

## Demo


https://github.com/user-attachments/assets/0acb8291-47b4-4521-a6fa-a88b9198609b

packages/twenty-server/src/engine/core-modules/feature-flag/feature-flag.entity.ts

@@ -25,6 +25,7 @@ export enum FeatureFlagKeys {
   IsMessagingAliasFetchingEnabled = 'IS_MESSAGING_ALIAS_FETCHING_ENABLED',
   IsGoogleCalendarSyncV2Enabled = 'IS_GOOGLE_CALENDAR_SYNC_V2_ENABLED',
   IsFreeAccessEnabled = 'IS_FREE_ACCESS_ENABLED',
+  IsFunctionSettingsEnabled = 'IS_FUNCTION_SETTINGS_ENABLED',
   IsWorkflowEnabled = 'IS_WORKFLOW_ENABLED',
 }
 

packages/twenty-server/src/engine/core-modules/file/file.utils.ts

@@ -23,7 +23,11 @@ export const checkFilePath = (filePath: string): string => {
     throw new BadRequestException(`Folder ${folder} is not allowed`);
   }
 
-  if (size && !settings.storage.imageCropSizes[folder]?.includes(size)) {
+  if (
+    folder !== kebabCase(FileFolder.ServerlessFunction) &&
+    size &&
+    !settings.storage.imageCropSizes[folder]?.includes(size)
+  ) {
     throw new BadRequestException(`Size ${size} is not allowed`);
   }