Aggregate queries follow up (#9581)

In this PR

- fixing Collapse on view groups views: aggregate bar should be included
in the collapse (@magrinj )
- respect the html table pattern: the aggregate bar is now a <tr>
element included in a <table> (before that, it was a <tr> not included
in anything)
- add a top-border on the aggregate bar
- introduce short labels for the on-cell value display (display "Empty"
instead of "Count empty" to lighten the interface)
- remove the feature flag !

packages/twenty-server/src/engine/core-modules/feature-flag/enums/feature-flag-key.enum.ts

@@ -12,7 +12,6 @@ export enum FeatureFlagKey {
   IsUniqueIndexesEnabled = 'IS_UNIQUE_INDEXES_ENABLED',
   IsMicrosoftSyncEnabled = 'IS_MICROSOFT_SYNC_ENABLED',
   IsAdvancedFiltersEnabled = 'IS_ADVANCED_FILTERS_ENABLED',
-  IsAggregateQueryEnabled = 'IS_AGGREGATE_QUERY_ENABLED',
   IsCommandMenuV2Enabled = 'IS_COMMAND_MENU_V2_ENABLED',
   IsCrmMigrationEnabled = 'IS_CRM_MIGRATION_ENABLED',
   IsJsonFilterEnabled = 'IS_JSON_FILTER_ENABLED',