Enable editing for calendar event custom fields (#17063)

## Summary
- Enable editing for custom calendar event fields while keeping standard
fields read-only
- Load calendar event fields dynamically so custom field values are
editable everywhere they appear
- Preserve calendar event participants rendering

## Testing
- npx nx run twenty-front:lint:diff-with-main --skip-nx-cache
--output-style=stream
- npx jest --config packages/twenty-front/jest.config.mjs
--runTestsByPath
packages/twenty-front/src/modules/activities/calendar/hooks/__tests__/useCalendarEvents.test.tsx

## Notes
- Full nx lint/test are very slow locally after barrel generation; CI
should run the full suite

---------

Co-authored-by: Charles Bochet <charles@twenty.com>

packages/twenty-front/src/modules/command-menu/pages/calendar-event/components/CommandMenuCalendarEventPage.tsx

@@ -1,8 +1,9 @@
 import { CalendarEventDetails } from '@/activities/calendar/components/CalendarEventDetails';
 import { CalendarEventDetailsEffect } from '@/activities/calendar/components/CalendarEventDetailsEffect';
-import { FIND_ONE_CALENDAR_EVENT_OPERATION_SIGNATURE } from '@/activities/calendar/graphql/operation-signatures/FindOneCalendarEventOperationSignature';
 import { type CalendarEvent } from '@/activities/calendar/types/CalendarEvent';
 import { viewableRecordIdComponentState } from '@/command-menu/pages/record-page/states/viewableRecordIdComponentState';
+import { CoreObjectNameSingular } from '@/object-metadata/types/CoreObjectNameSingular';
+import { useGenerateDepthRecordGqlFieldsFromObject } from '@/object-record/graphql/record-gql-fields/hooks/useGenerateDepthRecordGqlFieldsFromObject';
 import { useFindOneRecord } from '@/object-record/hooks/useFindOneRecord';
 import { useUpsertRecordsInStore } from '@/object-record/record-store/hooks/useUpsertRecordsInStore';
 import { useRecoilComponentValue } from '@/ui/utilities/state/component-state/hooks/useRecoilComponentValue';
@@ -13,11 +14,31 @@ export const CommandMenuCalendarEventPage = () => {
     viewableRecordIdComponentState,
   );
 
+  const { recordGqlFields } = useGenerateDepthRecordGqlFieldsFromObject({
+    objectNameSingular: CoreObjectNameSingular.CalendarEvent,
+    depth: 1,
+  });
+
+  const calendarEventRecordGqlFields = {
+    ...recordGqlFields,
+    calendarEventParticipants: {
+      id: true,
+      person: true,
+      workspaceMember: true,
+      isOrganizer: true,
+      responseStatus: true,
+      handle: true,
+      createdAt: true,
+      calendarEventId: true,
+      updatedAt: true,
+      displayName: true,
+    },
+  };
+
   const { record: calendarEvent } = useFindOneRecord<CalendarEvent>({
-    objectNameSingular:
-      FIND_ONE_CALENDAR_EVENT_OPERATION_SIGNATURE.objectNameSingular,
+    objectNameSingular: CoreObjectNameSingular.CalendarEvent,
     objectRecordId: viewableRecordId ?? '',
-    recordGqlFields: FIND_ONE_CALENDAR_EVENT_OPERATION_SIGNATURE.fields,
+    recordGqlFields: calendarEventRecordGqlFields,
     // TODO: this is not executed on sub-sequent runs, make sure that it is intended
     onCompleted: (record) => {
       upsertRecordsInStore({ partialRecords: [record] });