Improve test tooling (#18259)

## Summary

Unifies test mocking tooling across Jest and Storybook, replaces
handcrafted mock data with auto-generated server-fetched data, and
restructures the mock data generation script for maintainability.

### Mock data generation

- Split `generate-mock-data.ts` into three focused modules under
`scripts/mock-data/`:
  - `utils.ts` — shared authentication, GraphQL client, and file writer
  - `generate-metadata.ts` — fetches object metadata from `/metadata`
- `generate-record-data.ts` — fetches record data from `/graphql` using
metadata-driven dynamic queries
- The orchestrator (`generate-mock-data.ts`) authenticates once and
passes the token to both generators
- Company records are now fetched from the actual server (limited to 10
records) instead of being handcrafted
- Generated files are organized under `generated/metadata/objects/` and
`generated/data/companies/`

### Unified test utilities

- Consolidated Jest and MSW mocking into shared utilities that compose
production code (`prefillRecord`, `getRecordNodeFromRecord`,
`getRecordConnectionFromRecords`) with mock metadata
- Renamed `generateEmptyJestRecordNode` → `generateMockRecordNode` and
moved to `testing/utils/`
- Extracted `generateMockRecordConnection` into its own file
- Removed `sanitizeInputForPrefill` workaround (no longer needed with
correctly shaped generated data)

packages/twenty-front/src/modules/object-record/hooks/__tests__/useFindOneRecord.test.tsx

@@ -5,7 +5,7 @@ import {
   variables,
 } from '@/object-record/hooks/__mocks__/useFindOneRecord';
 import { useFindOneRecord } from '@/object-record/hooks/useFindOneRecord';
-import { generateEmptyJestRecordNode } from '~/testing/jest/generateEmptyJestRecordNode';
+import { generateMockRecordNode } from '~/testing/utils/generateMockRecordNode';
 import { getJestMetadataAndApolloMocksWrapper } from '~/testing/jest/getJestMetadataAndApolloMocksWrapper';
 
 const mocks = [
@@ -16,7 +16,7 @@ const mocks = [
     },
     result: jest.fn(() => ({
       data: {
-        person: generateEmptyJestRecordNode({
+        person: generateMockRecordNode({
           objectNameSingular: 'person',
           input: { id: '6205681e-7c11-40b4-9e32-f523dbe54590' },
           withDepthOneRelation: true,