Fix ObjectType casing and conflict between Relation and RelationMetadata (#9849)

Fixes #9827 

Also uncovered a conflict with `@objectType('Relation')` and
`@objectType('relation)`

I don't want to address it in this PR so I will create a followup issue
when we close this but I think there's a confusion between
Relation/RelationMetadata, it's unclear what is what

---------

Co-authored-by: Antoine Moreaux <moreaux.antoine@gmail.com>

packages/twenty-server/src/engine/core-modules/sso/sso.module.ts

@@ -6,7 +6,7 @@ import { NestjsQueryTypeOrmModule } from '@ptc-org/nestjs-query-typeorm';
 
 import { AppToken } from 'src/engine/core-modules/app-token/app-token.entity';
 import { BillingModule } from 'src/engine/core-modules/billing/billing.module';
-import { FeatureFlagEntity } from 'src/engine/core-modules/feature-flag/feature-flag.entity';
+import { FeatureFlag } from 'src/engine/core-modules/feature-flag/feature-flag.entity';
 import { SSOService } from 'src/engine/core-modules/sso/services/sso.service';
 import { SSOResolver } from 'src/engine/core-modules/sso/sso.resolver';
 import { WorkspaceSSOIdentityProvider } from 'src/engine/core-modules/sso/workspace-sso-identity-provider.entity';
@@ -17,7 +17,7 @@ import { GuardRedirectModule } from 'src/engine/core-modules/guard-redirect/guar
 @Module({
   imports: [
     NestjsQueryTypeOrmModule.forFeature(
-      [WorkspaceSSOIdentityProvider, User, AppToken, FeatureFlagEntity],
+      [WorkspaceSSOIdentityProvider, User, AppToken, FeatureFlag],
       'core',
     ),
     BillingModule,

packages/twenty-server/src/engine/core-modules/sso/workspace-sso-identity-provider.entity.ts

@@ -45,7 +45,7 @@ registerEnumType(SSOIdentityProviderStatus, {
 });
 
 @Entity({ name: 'workspaceSSOIdentityProvider', schema: 'core' })
-@ObjectType('WorkspaceSSOIdentityProvider')
+@ObjectType()
 export class WorkspaceSSOIdentityProvider {
   // COMMON
   @IDField(() => UUIDScalarType)