Remove all messages from cache when removing a connected account

[bosiraphael]

Scope & Context

We should remove all messages to import linked to a connected account it's deleted.

Technical inputs

• Add a listener on message channel deletion

await this.cacheStorage.setPop(
      `messages-to-import:${workspaceId}:gmail:${messageChannelId}`,
    );

[greptile-apps]

To remove all messages from cache when a connected account is deleted, follow these steps:

1. Open src/listeners/messaging-connected-account.listener.ts.
2. Add a listener for the message channel deletion event.
3. Use the cacheStorage.setPop method to remove messages from the cache:

await this.cacheStorage.setPop(
  `messages-to-import:${workspaceId}:gmail:${messageChannelId}`,
);

References

[bosiraphael]

Closed by #6021