Refactor sync sub status and throttle (#5734)

- Rename syncSubStatus to syncStage
- Rename ongoingSyncStartedAt to syncStageStartedAt
- Remove throttlePauseUntil from db and compute it with
syncStageStartedAt and throttleFailureCount

packages/twenty-front/src/testing/mock-data/generated/standard-metadata-query-result.ts

@@ -6903,9 +6903,9 @@ export const mockedStandardObjectMetadataQueryResult: ObjectMetadataItemsQuery =
                   options: null,
                   id: '24147b01-4394-4aee-92a4-5f6b5073704f',
                   type: 'DATE_TIME',
-                  name: 'ongoingSyncStartedAt',
-                  label: 'Ongoing sync started at',
-                  description: 'Ongoing sync started at',
+                  name: 'syncStageStartedAt',
+                  label: 'Sync stage started at',
+                  description: 'Sync stage started at',
                   icon: 'IconHistory',
                   isCustom: false,
                   isActive: true,