Enhancements to the Use in-meeting controls APIs, adding error messages for accounts over cloud storage limits or without access to the API. It also notes a new user_key field added to the session.user_joined and session.user_left Video SDK webhooks.

User key added to user webhook events


## Enhancements

Add error messages in the Use in-meeting controls APIs, `PATCH` `/v2/videosdk/sessions/{sessionId}/events`:
- `300` - `This API is not available for this account, please contact Zoom support.`
- `300` - `The account is over is meeting and webinar cloud storage limits. Additional storage needs to be purchased or cloud recordings need to be deleted. `

New `user_key` field in the following Video SDK webhooks:
- `session.user_joined`
- `session.user_left`
