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/workspace-manager/workspace-sync-metadata/interfaces/partial-field-metadata.interface.ts

@@ -5,6 +5,7 @@ import { WorkspaceDynamicRelationMetadataArgsFactory } from 'src/engine/twenty-o
 
 import { ObjectMetadataEntity } from 'src/engine/metadata-modules/object-metadata/object-metadata.entity';
 
+// Should get deprecated in favor of the FlatFieldMetadata
 export type PartialFieldMetadata<
   T extends FieldMetadataType = FieldMetadataType,
 > = Omit<
@@ -15,6 +16,15 @@ export type PartialFieldMetadata<
   | 'objectMetadataId'
   | 'createdAt'
   | 'updatedAt'
+  | 'standardId'
+  | 'icon'
+  | 'isSystem'
+  | 'workspaceId'
+  | 'isActive'
+  | 'asExpression'
+  | 'indexFieldMetadatas'
+  | 'fieldPermissions'
+  | 'object'
 > & {
   standardId: string;
   label: string | ((objectMetadata: ObjectMetadataEntity) => string);
@@ -24,8 +34,8 @@ export type PartialFieldMetadata<
   workspaceId: string;
   objectMetadataId?: string;
   isActive?: boolean;
-  asExpression?: string;
-  generatedType?: 'STORED' | 'VIRTUAL';
+  asExpression?: string; // not accurate
+  generatedType?: 'STORED' | 'VIRTUAL'; // not accurate
 };
 
 export type PartialComputedFieldMetadata = {