[Server Integration tests] Enrich integration GraphQL API tests (#7699)

### Description

- We are using gql instead of strings to be able to see the graphql code
highlighted

### Demo


![](https://assets-service.gitstart.com/28455/d06016b9-c62c-4e0d-bb16-3d7dd42c5b6b.png)

Fixes #7526

---------

Co-authored-by: gitstart-twenty <gitstart-twenty@users.noreply.github.com>
Co-authored-by: Charles Bochet <charles@twenty.com>
Co-authored-by: Charles Bochet <charlesBochet@users.noreply.github.com>

packages/twenty-server/test/integration/graphql/codegen/introspection.interface.ts

@@ -0,0 +1,60 @@
+export interface IntrospectionResponse {
+  data: {
+    __schema: Schema;
+  };
+}
+
+export interface Schema {
+  queryType: { name: string };
+  mutationType: { name: string | null };
+  subscriptionType: { name: string | null };
+  types: GraphQLType[];
+  directives: Directive[];
+}
+
+export interface Directive {
+  name: string;
+  description: string | null;
+  locations: string[];
+  args: InputValue[];
+}
+
+export interface GraphQLType {
+  kind: string;
+  name: string;
+  description: string | null;
+  fields?: Field[];
+  inputFields?: InputValue[];
+  interfaces?: TypeRef[];
+  enumValues?: EnumValue[];
+  possibleTypes?: TypeRef[];
+}
+
+export interface Field {
+  name: string;
+  description: string | null;
+  args: InputValue[];
+  type: TypeRef;
+  isDeprecated: boolean;
+  deprecationReason: string | null;
+}
+
+export interface InputValue {
+  name: string;
+  description: string | null;
+  type: TypeRef;
+  defaultValue: string | null;
+}
+
+export interface TypeRef {
+  kind: string;
+  name: string | null;
+  ofType: TypeRef | null;
+}
+
+export interface EnumValue {
+  name: string;
+  description: string | null;
+  isDeprecated: boolean;
+  deprecationReason: string | null;
+}