### What?
Supersedes https://github.com/payloadcms/payload/pull/11490.
Refactors imports of `formatAdminURL` to import from `payload/shared`
instead of `@payloadcms/ui/shared`. The ui package now imports and
re-exports the function to prevent this from being a breaking change.
### Why?
This makes it easier for other packages/plugins to consume the
`formatAdminURL` function instead of needing to implement their own or
rely on the ui package for the utility.
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