remove nestjs-query auto-resolver from index-metadata (#22775)

## Summary

Removes the `NestjsQueryGraphQLModule.forFeature` block from
`IndexMetadataModule`, continuing the incremental migration off
`@ptc-org/nestjs-query`.

- Drops the dead auto-generated read surface: `index` and
`indexMetadatas` queries, the `IndexConnection` /
`IndexObjectMetadataConnection` types, and the `Index.objectMetadata`
field. No client consumes these — the frontend reads indexes via
`ObjectMetadata.indexMetadatas`.
- Keeps `IndexMetadataDTO` nestjs-query-compatible (`@Authorize`,
`@FilterableField`, `@QueryOptions`, `@IDField`) because
`ObjectMetadataDTO` still references it via
`@CursorConnection('indexMetadatas')` until object-metadata is migrated.
- Hand-written `createOneIndex` / `deleteOneIndex` mutations and the
`indexFieldMetadataList` resolve-field are unchanged.
- Deletes the now-obsolete `index-metadatas` integration test and
regenerates the GraphQL schema artifacts (frontend + client-sdk).

## Breaking change

This is an intentional GraphQL schema breaking change
(`api-breaking-changes` CI will flag it)

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packages/twenty-front/src/generated-metadata/graphql.ts

@@ -2061,24 +2061,9 @@ export type Index = {
   isCustom?: Maybe<Scalars['Boolean']['output']>;
   isUnique: Scalars['Boolean']['output'];
   name: Scalars['String']['output'];
-  objectMetadata: IndexObjectMetadataConnection;
   updatedAt: Scalars['DateTime']['output'];
 };
 
-
-export type IndexObjectMetadataArgs = {
-  filter?: ObjectFilter;
-  paging?: CursorPaging;
-};
-
-export type IndexConnection = {
-  __typename?: 'IndexConnection';
-  /** Array of edges. */
-  edges: Array<IndexEdge>;
-  /** Paging information */
-  pageInfo: PageInfo;
-};
-
 export type IndexEdge = {
   __typename?: 'IndexEdge';
   /** Cursor for this node. */
@@ -2104,14 +2089,6 @@ export type IndexFilter = {
   or?: InputMaybe<Array<IndexFilter>>;
 };
 
-export type IndexObjectMetadataConnection = {
-  __typename?: 'IndexObjectMetadataConnection';
-  /** Array of edges. */
-  edges: Array<ObjectEdge>;
-  /** Paging information */
-  pageInfo: PageInfo;
-};
-
 /** Type of the index */
 export enum IndexType {
   BTREE = 'BTREE',
@@ -4420,8 +4397,6 @@ export type Query = {
   getViewSorts: Array<ViewSort>;
   getViews: Array<View>;
   getWorkspaceCreationDefaults: WorkspaceCreationDefaultsDto;
-  index: Index;
-  indexMetadatas: IndexConnection;
   lineChartData: LineChartData;
   listPlans: Array<BillingPlan>;
   minimalMetadata: MinimalMetadata;
@@ -4763,17 +4738,6 @@ export type QueryGetViewsArgs = {
 };
 
 
-export type QueryIndexArgs = {
-  id: Scalars['UUID']['input'];
-};
-
-
-export type QueryIndexMetadatasArgs = {
-  filter?: IndexFilter;
-  paging?: CursorPaging;
-};
-
-
 export type QueryLineChartDataArgs = {
   input: LineChartDataInput;
 };