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/testing/jest/generateEmptyJestRecordNode.ts

@@ -1,43 +0,0 @@
-import { getRecordNodeFromRecord } from '@/object-record/cache/utils/getRecordNodeFromRecord';
-import { generateDepthRecordGqlFieldsFromObject } from '@/object-record/graphql/record-gql-fields/utils/generateDepthRecordGqlFieldsFromObject';
-import { prefillRecord } from '@/object-record/utils/prefillRecord';
-import { generatedMockObjectMetadataItems } from '~/testing/utils/generatedMockObjectMetadataItems';
-import { getMockObjectMetadataItemOrThrow } from '~/testing/utils/getMockObjectMetadataItemOrThrow';
-
-type GenerateEmptyJestRecordNodeArgs = {
-  objectNameSingular: string;
-  input: Record<string, unknown>;
-  withDepthOneRelation?: boolean;
-};
-export const generateEmptyJestRecordNode = ({
-  objectNameSingular,
-  input,
-  withDepthOneRelation = false,
-}: GenerateEmptyJestRecordNodeArgs) => {
-  const objectMetadataItem =
-    getMockObjectMetadataItemOrThrow(objectNameSingular);
-
-  if (!objectMetadataItem) {
-    throw new Error(
-      `ObjectMetadataItem not found for objectNameSingular: ${objectNameSingular} while generating empty Jest record node`,
-    );
-  }
-
-  const prefilledRecord = prefillRecord({
-    objectMetadataItem,
-    input,
-  });
-
-  return getRecordNodeFromRecord({
-    record: prefilledRecord,
-    objectMetadataItem,
-    objectMetadataItems: generatedMockObjectMetadataItems,
-    recordGqlFields: withDepthOneRelation
-      ? generateDepthRecordGqlFieldsFromObject({
-          objectMetadataItem,
-          objectMetadataItems: generatedMockObjectMetadataItems,
-          depth: 1,
-        })
-      : undefined,
-  });
-};