Deprecate FieldMetadataInterface (#13264)

# Introduction

From the moment replaced the FieldMetadataInterface definition to:
```ts
import { FieldMetadataType } from 'twenty-shared/types';

import { FieldMetadataEntity } from 'src/engine/metadata-modules/field-metadata/field-metadata.entity';

export type FieldMetadataInterface<
  T extends FieldMetadataType = FieldMetadataType,
> = FieldMetadataEntity<T>;
```
After this PR merge will create a new one removing the type and
replacing it to `FieldMetadataEntity`.
Did not renamed it here to avoid conflicts on naming + type issues fixs
within the same PR

## Field metadata entity RELATION or MORPH
Relations fields cannot be null for those field metadata entity instance
anymore, but are never for the others see
`packages/twenty-server/src/engine/metadata-modules/field-metadata/types/field-metadata-entity-test.type.ts`
( introduced TypeScript tests )

## Concerns
- TS_VECTOR is the most at risk with the `generatedType` and
`asExpression` removal from interface

## What's next
- `FielMetadataInterface` removal and rename ( see introduction )
- Depcrecating `ObjectMetadataInterface`
- Refactor `FieldMetadataEntity` optional fiels to be nullable only
- TO DIG `never` occurences on settings, defaultValue etc
- Some interfaces will be replaced by the `FlatFieldMetadata` when
deprecating the current sync and comparators tools

packages/twenty-server/src/engine/twenty-orm/entity-manager/workspace-entity-manager.spec.ts

@@ -7,6 +7,7 @@ import { WorkspaceInternalContext } from 'src/engine/twenty-orm/interfaces/works
 
 import { WorkspaceDataSource } from 'src/engine/twenty-orm/datasource/workspace.datasource';
 import { validateOperationIsPermittedOrThrow } from 'src/engine/twenty-orm/repository/permissions.utils';
+import { ObjectMetadataItemWithFieldMaps } from 'src/engine/metadata-modules/types/object-metadata-item-with-field-maps';
 
 import { WorkspaceEntityManager } from './workspace-entity-manager';
 
@@ -88,7 +89,7 @@ describe('WorkspaceEntityManager', () => {
             },
             fieldIdByName: { fieldName: 'field-id' },
             fieldIdByJoinColumnName: {},
-          },
+          } as unknown as ObjectMetadataItemWithFieldMaps,
         },
         idByNameSingular: {
           'test-entity': 'test-entity-id',

packages/twenty-server/src/engine/twenty-orm/factories/entity-schema-column.factory.ts

@@ -67,7 +67,7 @@ export class EntitySchemaColumnFactory {
         entitySchemaColumnMap[joinColumnName] = {
           name: joinColumnName,
           type: 'uuid',
-          nullable: fieldMetadata.isNullable,
+          nullable: fieldMetadata.isNullable ?? false,
         };
 
         continue;
@@ -92,7 +92,7 @@ export class EntitySchemaColumnFactory {
         type: columnType as ColumnType,
         // TODO: We should double check that
         primary: key === 'id',
-        nullable: fieldMetadata.isNullable,
+        nullable: fieldMetadata.isNullable ?? false,
         createDate: key === 'createdAt',
         updateDate: key === 'updatedAt',
         deleteDate: key === 'deletedAt',

packages/twenty-server/src/engine/twenty-orm/repository/workspace-delete-query-builder.ts

@@ -56,7 +56,7 @@ export class WorkspaceDeleteQueryBuilder<
     ) as this;
   }
 
-  override async execute(): Promise<DeleteResult> {
+  override async execute(): Promise<DeleteResult & { generatedMaps: T[] }> {
     validateQueryIsPermittedOrThrow(
       this.expressionMap,
       this.objectRecordsPermissions,