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/test/integration/metadata/suites/field-metadata/utils/create-one-field-metadata.util.ts

@@ -8,14 +8,14 @@ import { PerformMetadataQueryParams } from 'test/integration/metadata/types/perf
 import { warnIfNoErrorButExpectedToFail } from 'test/integration/metadata/utils/warn-if-no-error-but-expected-to-fail.util';
 import { FieldMetadataType } from 'twenty-shared/types';
 
-import { FieldMetadataInterface } from 'src/engine/metadata-modules/field-metadata/interfaces/field-metadata.interface';
+import { FieldMetadataDTO } from 'src/engine/metadata-modules/field-metadata/dtos/field-metadata.dto';
 
 export const createOneFieldMetadata = async <T extends FieldMetadataType>({
   input,
   gqlFields,
   expectToFail = false,
 }: PerformMetadataQueryParams<CreateOneFieldFactoryInput>): CommonResponseBody<{
-  createOneField: FieldMetadataInterface<T>;
+  createOneField: FieldMetadataDTO<T>;
 }> => {
   const graphqlOperation = createOneFieldMetadataQueryFactory({
     input,