Remove isMultiSelect feature flag (#5280)

As title

Co-authored-by: Thomas Trompette <thomast@twenty.com>

packages/twenty-server/src/database/typeorm-seeds/core/feature-flags.ts

@@ -40,11 +40,6 @@ export const seedFeatureFlags = async (
         workspaceId: workspaceId,
         value: true,
       },
-      {
-        key: FeatureFlagKeys.IsMultiSelectEnabled,
-        workspaceId: workspaceId,
-        value: true,
-      },
       {
         key: FeatureFlagKeys.IsStripeIntegrationEnabled,
         workspaceId: workspaceId,

packages/twenty-server/src/engine/core-modules/feature-flag/feature-flag.entity.ts

@@ -22,7 +22,6 @@ export enum FeatureFlagKeys {
   IsAirtableIntegrationEnabled = 'IS_AIRTABLE_INTEGRATION_ENABLED',
   IsPostgreSQLIntegrationEnabled = 'IS_POSTGRESQL_INTEGRATION_ENABLED',
   IsStripeIntegrationEnabled = 'IS_STRIPE_INTEGRATION_ENABLED',
-  IsMultiSelectEnabled = 'IS_MULTI_SELECT_ENABLED',
 }
 
 @Entity({ name: 'featureFlag', schema: 'core' })

packages/twenty-server/src/engine/workspace-manager/workspace-sync-metadata/commands/add-standard-id.command.ts

@@ -58,7 +58,6 @@ export class AddStandardIdCommand extends CommandRunner {
             IS_EVENT_OBJECT_ENABLED: true,
             IS_AIRTABLE_INTEGRATION_ENABLED: true,
             IS_POSTGRESQL_INTEGRATION_ENABLED: true,
-            IS_MULTI_SELECT_ENABLED: false,
             IS_STRIPE_INTEGRATION_ENABLED: false,
           },
         );
@@ -74,7 +73,6 @@ export class AddStandardIdCommand extends CommandRunner {
           IS_EVENT_OBJECT_ENABLED: true,
           IS_AIRTABLE_INTEGRATION_ENABLED: true,
           IS_POSTGRESQL_INTEGRATION_ENABLED: true,
-          IS_MULTI_SELECT_ENABLED: false,
           IS_STRIPE_INTEGRATION_ENABLED: false,
         },
       );