Remove old Calendar and Messaging partial/full sync stages (#15380)

Now that all existing and new workspaces have the following syncStage:
- CALENDAR_EVENT_LIST_FETCH_PENDING
- MESSAGE_LIST_FETCH_PENDING

We can fully deprecate the old FULL_CALENDAR_EVENT_LIST_FETCH_PENDING
and PARTIAL_CALENDAR_EVENT_LIST_FETCH_PENDING (full vs partial is now
directly inferred from the presence of a cursor)

packages/twenty-server/src/engine/core-modules/auth/services/reset-calendar-channel.service.ts

@@ -35,8 +35,7 @@ export class ResetCalendarChannelService {
         connectedAccountId,
       },
       {
-        syncStage:
-          CalendarChannelSyncStage.FULL_CALENDAR_EVENT_LIST_FETCH_PENDING,
+        syncStage: CalendarChannelSyncStage.CALENDAR_EVENT_LIST_FETCH_PENDING,
         syncStatus: null,
         syncCursor: '',
         syncStageStartedAt: null,

packages/twenty-server/src/engine/core-modules/auth/services/reset-message-channel.service.ts

@@ -34,7 +34,7 @@ export class ResetMessageChannelService {
         connectedAccountId,
       },
       {
-        syncStage: MessageChannelSyncStage.FULL_MESSAGE_LIST_FETCH_PENDING,
+        syncStage: MessageChannelSyncStage.MESSAGE_LIST_FETCH_PENDING,
         syncStatus: MessageChannelSyncStatus.ONGOING,
         syncCursor: '',
         syncStageStartedAt: null,