## Context
Calendar tables are behind a featureFlag, they do not exist if the
feature flag is off which means we should not use them for the same
reason. I'm adding a check on the featureFlag before calling the
repository.
```
Error executing raw query for workspace 20202020-1c25-4d02-bf25-6aeccf7ea419: relation "workspace_1wgvd1injqtife6y4rvfbu3h5.calendarEventParticipant" does not exist
```
## Test
locally with and without featureflag
- If sync fails we set authFailedAt
- This information is displayed in the frontend in accounts with a `Sync
Failed` pill
- The user can reconnect his account in the dropdown menu
- A new OAuth flow is triggered
- The account is synced
* fixes
* saving workspaceMemberId and personId when saving attendees
* add typing
* use Map
* improve saveMessageParticipants
* fix role type
* move logic in a service
* create new service
* use new service in calendar-event-attendee.service
* modify service to include more common logic
* add defaumt value to isOrganizer in calendar-event-attendee.object-metadata
* rename folder
* renaming
* rename database services to repository
* refactor more repositories
* more refactoring
* followup
* remove unused imports
* fix
* fix
* Fix calendar listener being called when flag is off
* remove folders
