Private playbooks with triggers show incorrectly in the channel when you do not have permissions

[mattermod]

Summary

When you use the triggered playbook feature for a private playbook in a channel, it shows the playbook then deletes it creating a weird experience. See video.

Steps to repro

1. Create a private playbook for a user
2. Use channel actions to make that private playbook trigger when typing a keyword
3. Switch to another user who’s not a member of that playbook
4. use the trigger word in the channel
5. Get prompted for the private playbook
6. click run
7. now the private playbook doesn’t show and the post was deleted

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JIRA: https://mattermost.atlassian.net/browse/MM-57844