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-server/test/integration/graphql/suites/object-generated/index-metadatas.integration-spec.ts

@@ -1,59 +0,0 @@
-import request from 'supertest';
-
-const client = request(`http://localhost:${APP_PORT}`);
-
-describe('indexMetadatasResolver (e2e)', () => {
-  it('should find many indexMetadatas', () => {
-    const queryData = {
-      query: `
-        query indexMetadatas {
-          indexMetadatas {
-            edges {
-              node {
-                id
-                name
-                isCustom
-                isUnique
-                indexWhereClause
-                indexType
-                createdAt
-                updatedAt
-              }
-            }
-          }
-        }
-      `,
-    };
-
-    return client
-      .post('/metadata')
-      .set('Authorization', `Bearer ${APPLE_JANE_ADMIN_ACCESS_TOKEN}`)
-      .send(queryData)
-      .expect(200)
-      .expect((res) => {
-        expect(res.body.data).toBeDefined();
-        expect(res.body.errors).toBeUndefined();
-      })
-      .expect((res) => {
-        const data = res.body.data.indexMetadatas;
-
-        expect(data).toBeDefined();
-        expect(Array.isArray(data.edges)).toBe(true);
-
-        const edges = data.edges;
-
-        if (edges.length > 0) {
-          const indexMetadatas = edges[0].node;
-
-          expect(indexMetadatas).toHaveProperty('id');
-          expect(indexMetadatas).toHaveProperty('name');
-          expect(indexMetadatas).toHaveProperty('isCustom');
-          expect(indexMetadatas).toHaveProperty('isUnique');
-          expect(indexMetadatas).toHaveProperty('indexWhereClause');
-          expect(indexMetadatas).toHaveProperty('indexType');
-          expect(indexMetadatas).toHaveProperty('createdAt');
-          expect(indexMetadatas).toHaveProperty('updatedAt');
-        }
-      });
-  });
-});