MM-15324 override ephemeral post example

[scottleedavis]

Summary

Include example for registering a custom ephemeral post type

Ticket Link

• Allow plugins to override ephemeral posts mattermost#10797

Related Pull Requests

• MM-15324 Allow plugins override ephemeral posts mattermost-webapp#2759
• MM-15324-DOC post types can apply for ephemeral posts mattermost-webapp#3024

[marianunez]

Does adding this ephemeral override post example here needed? I feel that with the basic post override example and what was added with this PR that is reflected in the detailed Registry section of this same document would be enough. 1/5
Thoughts? @lieut-data

[lieut-data]

I do think there's value in testing this, though as I note below, we should wire it up to the server-side of the plugin to actually use it. QA uses the demo plugin to verify functionality, and having this ready-to-go will enable trivial verification.

[scottleedavis]

Thank you both again for your time.