View field override (#18572)

## Context
This PR introduces overrides for view fields which will be useful for
page layout FIELDS widgets fields position/groups/visibility override +
restore logic.

packages/twenty-server/src/engine/metadata-modules/page-layout-tab/resolvers/page-layout-tab.resolver.ts

@@ -15,6 +15,7 @@ import {
 } from '@nestjs/graphql';
 
 import { PermissionFlagType } from 'twenty-shared/constants';
+import { isDefined } from 'twenty-shared/utils';
 
 import { MetadataResolver } from 'src/engine/api/graphql/graphql-config/decorators/metadata-resolver.decorator';
 import { ResolverValidationPipe } from 'src/engine/core-modules/graphql/pipes/resolver-validation.pipe';
@@ -70,6 +71,11 @@ export class PageLayoutTabResolver {
     return resolveOverridableEntityProperty(tab, 'icon');
   }
 
+  @ResolveField(() => Boolean)
+  isOverridden(@Parent() tab: PageLayoutTabDTO): boolean {
+    return isDefined(tab.overrides) && Object.keys(tab.overrides).length > 0;
+  }
+
   @Query(() => [PageLayoutTabDTO])
   @UseGuards(NoPermissionGuard)
   async getPageLayoutTabs(