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Fixes #
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### What?
This PR fixes an issue where the unpublish modal was unreachable due to
the high `z-index` on `Drawer` components. This makes unpublishing
documents from a drawer impossible. For example, when editting a
document from the drawer opened in a `RelationshipTable`.
### Why?
To allow editors to be able to unpublish docs regardless of drawer depth
and context.
### How?
By rendering the unpublish modal at a sufficiently high z-index, while
taking into account edit depth.
Fixes#10108
Before:
[Dashboard-unpublish-before--Payload.webm](https://github.com/user-attachments/assets/7acf1002-138e-48bd-81ec-76f5eabfb2d4)
After:
[Dashboard-unpublish-after--Payload.webm](https://github.com/user-attachments/assets/ff109ee9-5b63-43d0-931f-500ded8f6d3a)