Wagtail wish list: Previewing banners should only show current banners

[dorothyyeager]

Summary

What we are after:
When we preview banners, we see every banner ever. It would be nice to only see the banners that are current.

Screenshot of current situation

Completion criteria

• Banners shown are the current ones and the draft one we are previewing.
• Old ones that we keep unpublished to re-use are not shown.

Tech steps or considerations (optional)

List any considerations the tech team should know. Additionally, any specific tech steps can be included here.

• First
• Next
• Then

Future work

Other future work that may be needed following this issue's completion.

[patphongs]

Priority is to work on transition page migration right now, moving this to PI 14