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/command-menu/pages/message-thread/hooks/__tests__/useEmailThreadInCommandMenu.test.tsx

@@ -11,7 +11,7 @@ import {
   QUERY_MAX_RECORDS,
 } from 'twenty-shared/constants';
 import { MessageParticipantRole } from 'twenty-shared/types';
-import { generateEmptyJestRecordNode } from '~/testing/jest/generateEmptyJestRecordNode';
+import { generateMockRecordNode } from '~/testing/utils/generateMockRecordNode';
 import { getJestMetadataAndApolloMocksWrapper } from '~/testing/jest/getJestMetadataAndApolloMocksWrapper';
 import { generatedMockObjectMetadataItems } from '~/testing/utils/generatedMockObjectMetadataItems';
 import { getMockObjectMetadataItemOrThrow } from '~/testing/utils/getMockObjectMetadataItemOrThrow';
@@ -84,7 +84,7 @@ const mocks = [
         messages: {
           edges: [
             {
-              node: generateEmptyJestRecordNode({
+              node: generateMockRecordNode({
                 objectNameSingular: 'message',
                 input: {
                   id: '1',
@@ -95,7 +95,7 @@ const mocks = [
               cursor: '1',
             },
             {
-              node: generateEmptyJestRecordNode({
+              node: generateMockRecordNode({
                 objectNameSingular: 'message',
                 input: {
                   id: '2',
@@ -135,7 +135,7 @@ const mocks = [
         messageParticipants: {
           edges: [
             {
-              node: generateEmptyJestRecordNode({
+              node: generateMockRecordNode({
                 objectNameSingular: 'messageParticipant',
                 input: {
                   id: 'messageParticipant-1',
@@ -146,7 +146,7 @@ const mocks = [
               cursor: '1',
             },
             {
-              node: generateEmptyJestRecordNode({
+              node: generateMockRecordNode({
                 objectNameSingular: 'messageParticipant',
                 input: {
                   id: 'messageParticipant-2',