Add Dashboard in Lab, make Calendar available out of lab (#15560)

As per title!

packages/twenty-server/src/modules/timeline/standard-objects/timeline-activity.workspace-entity.ts

@@ -5,13 +5,11 @@ import { RelationOnDeleteAction } from 'src/engine/metadata-modules/field-metada
 import { RelationType } from 'src/engine/metadata-modules/field-metadata/interfaces/relation-type.interface';
 import { Relation } from 'src/engine/workspace-manager/workspace-sync-metadata/interfaces/relation.interface';
 
-import { FeatureFlagKey } from 'src/engine/core-modules/feature-flag/enums/feature-flag-key.enum';
 import { BaseWorkspaceEntity } from 'src/engine/twenty-orm/base.workspace-entity';
 import { CustomWorkspaceEntity } from 'src/engine/twenty-orm/custom.workspace-entity';
 import { WorkspaceDynamicRelation } from 'src/engine/twenty-orm/decorators/workspace-dynamic-relation.decorator';
 import { WorkspaceEntity } from 'src/engine/twenty-orm/decorators/workspace-entity.decorator';
 import { WorkspaceField } from 'src/engine/twenty-orm/decorators/workspace-field.decorator';
-import { WorkspaceGate } from 'src/engine/twenty-orm/decorators/workspace-gate.decorator';
 import { WorkspaceIsNotAuditLogged } from 'src/engine/twenty-orm/decorators/workspace-is-not-audit-logged.decorator';
 import { WorkspaceIsNullable } from 'src/engine/twenty-orm/decorators/workspace-is-nullable.decorator';
 import { WorkspaceIsSystem } from 'src/engine/twenty-orm/decorators/workspace-is-system.decorator';
@@ -256,16 +254,10 @@ export class TimelineActivityWorkspaceEntity extends BaseWorkspaceEntity {
     inverseSideFieldKey: 'timelineActivities',
     onDelete: RelationOnDeleteAction.SET_NULL,
   })
-  @WorkspaceGate({
-    featureFlag: FeatureFlagKey.IS_PAGE_LAYOUT_ENABLED,
-  })
   @WorkspaceIsNullable()
   dashboard: Relation<DashboardWorkspaceEntity> | null;
 
   @WorkspaceJoinColumn('dashboard')
-  @WorkspaceGate({
-    featureFlag: FeatureFlagKey.IS_PAGE_LAYOUT_ENABLED,
-  })
   dashboardId: string | null;
 
   @WorkspaceDynamicRelation({