Fixes for issues that made meeting settings inconsistent when creating meetings via API. This was a series of backend changes affecting any API that creates meetings.

Fixes to inconsistencies to meeting settings when creating meetings via API


## Changed

- Updates to these two APIs:
  - `PATCH /v2/accounts/{accountId}/meetings/{meetingId}`
  - `POST /v2/accounts/{accountId}/users/{userId}/meetings`
- When creating meetings via API, if no passcode or waiting room parameters are specified, the API will honor the user's configured settings.
- Meetings will automatically generate a passcode when user settings have passcode enabled.

## Fixed

- Fixed an issue where waiting rooms were sometimes enabled despite user preferences.
- Fixed an issue where meetings scheduled through third-party integrations weren't consistently following user meeting settings.
