refs https://github.com/TryGhost/Team/issues/1596
This commit updates admin to align with the changes in the backend in https://github.com/TryGhost/Ghost/pull/14798
- `post.email_recipient_filter` option and property is renamed to `email_segment`
- `newsletter_id` option is renamed to `newsletter` (and now uses slug instead of id)
- Sending a post via email, means you need to set the `newsletter` option. The `email_segment` option is optional now and defaults to `all`. Not setting `newsletter` means not sending an email, setting `email_segment` is ignored if `newsletter` is missing.
- We can no longer use `email_recipient_filter` (now renamed to `email_segment`) to know whether a post is published/scheduled to be sent as an email. We need to rely on the newsletter relation now. The `email_segment` `none` value has been dropped and will be `all` even if no email will be sent (newsletter will be null).
- `sendEmailWhenPublished` option is no longer supported in the backend.
3a11faf0b6