### What?
This PR updates the folder configuration types to explicitly omit the
`trash` option from `CollectionConfig` when used for folders.
### Why?
Currently, only documents are designed to support trashing. Allowing
folders to be trashed introduces inconsistencies, since removing a
folder does not properly remove its references from associated
documents.
By omitting `trash` from folder configurations, we prevent accidental
use of unsupported behavior until proper design and handling for folder
trashing is implemented.
### How?
- Updated `RootFoldersConfiguration.collectionOverrides` type to use
`Omit<CollectionConfig, 'trash'>`
- Ensures `trash` cannot be enabled on folders
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