fix(ui): remove slug field from rsc exports (#15480)

Removes the `SlugField` export from `@payloadcms/ui/rsc`. This is a
client component already exported from the client bundle:
```diff
- import { SlugField } from '@payloadcms/ui/rsc'
+ import { SlugField } from '@payloadcms/ui'
```

Author: jacobsfletch

packages/ui/src/exports/rsc/index.ts

@@ -3,7 +3,6 @@ export { FieldDiffLabel } from '../../elements/FieldDiffLabel/index.js'
 export{FolderTableCell}from'../../elements/FolderView/Cell/index.server.js'
 export{FolderField}from'../../elements/FolderView/FolderField/index.server.js'
 export{getHTMLDiffComponents}from'../../elements/HTMLDiff/index.js'
-export{SlugField}from'../../fields/Slug/index.js'
 export{_internal_renderFieldHandler}from'../../forms/fieldSchemasToFormState/serverFunctions/renderFieldServerFn.js'
 export{File}from'../../graphics/File/index.js'
 export{CheckIcon}from'../../icons/Check/index.js'