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/utils/convert-object-metadata-to-schema-properties.util.ts

@@ -130,7 +130,7 @@ export const convertObjectMetadataToSchemaProperties = ({
           type: 'array',
           items: {
             type: 'string',
-            enum: field.options.map(
+            enum: (field.options ?? []).map(
               (option: { value: string }) => option.value,
             ),
           },
@@ -139,7 +139,9 @@ export const convertObjectMetadataToSchemaProperties = ({
       case FieldMetadataType.SELECT:
         itemProperty = {
           type: 'string',
-          enum: field.options.map((option: { value: string }) => option.value),
+          enum: (field.options ?? []).map(
+            (option: { value: string }) => option.value,
+          ),
         };
         break;
       case FieldMetadataType.ARRAY:
@@ -153,7 +155,9 @@ export const convertObjectMetadataToSchemaProperties = ({
       case FieldMetadataType.RATING:
         itemProperty = {
           type: 'string',
-          enum: field.options.map((option: { value: string }) => option.value),
+          enum: (field.options ?? []).map(
+            (option: { value: string }) => option.value,
+          ),
         };
         break;
       case FieldMetadataType.LINKS: