## Description
- fcm_push_data didn't include the account id, so mobile clients had no
way to know which account a push notification belonged to. This adds
account_id to the FCM payload (it was already present in push_event_data
for ActionCable, just not FCM).
- Prerequisite for the mobile-side fix for
[chatwoot-mobile-app#1121](https://github.com/chatwoot/chatwoot-mobile-app/pull/1121)
(opening a conversation from a notification for a non-active account).
- Added a spec asserting fcm_push_data includes the account id.
Fixes
[CW-4235](https://linear.app/chatwoot/issue/CW-4235/the-conversation-fails-to-open-when-the-notifications-account-differs)
## Type of change
- [x] Bug fix (non-breaking change which fixes an issue)
Co-authored-by: Muhsin Keloth <muhsinkeramam@gmail.com>
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