3263 modify timeline messagingservice to allow the frontend to get multiple participants in a thread (#3611)

* wip

* wip

* add pagination

* wip

* wip

* wip

* update resolver

* wip

* wip

* endpoint is working but there is still work to do

* merge main

* wip

* subject is now first subject

* number of messages is working

* improving query

* fix bug

* fix bug

* added parameter

* pagination introduced a bug

* pagination is working

* fix type

* improve typing

* improve typing

* fix bug

* add displayName

* display displayName in the frontend

* move entities

* fix

* generate metadata

* add avatarUrl

* modify after comments on PR

* updates

* remove email mocks

* remove console log

* move files

* remove mock

* use constant

* use constant

* use fragments

* remove console.log

* generate

* changes made

* update DTO

* generate

packages/twenty-front/src/modules/activities/emails/queries/fragments/participantFragment.ts

@@ -0,0 +1,13 @@
+import { gql } from '@apollo/client';
+
+export const participantFragment = gql`
+  fragment ParticipantFragment on TimelineThreadParticipant {
+    personId
+    workspaceMemberId
+    firstName
+    lastName
+    displayName
+    avatarUrl
+    handle
+  }
+`;

packages/twenty-front/src/modules/activities/emails/queries/fragments/timelineThreadFragment.ts

@@ -0,0 +1,22 @@
+import { gql } from '@apollo/client';
+
+import { participantFragment } from '@/activities/emails/queries/fragments/participantFragment';
+
+export const timelineThreadFragment = gql`
+  fragment TimelineThreadFragment on TimelineThread {
+    id
+    read
+    firstParticipant {
+      ...ParticipantFragment
+    }
+    lastTwoParticipants {
+      ...ParticipantFragment
+    }
+    lastMessageReceivedAt
+    lastMessageBody
+    subject
+    numberOfMessagesInThread
+    participantCount
+  }
+  ${participantFragment}
+`;