feat(ui): add support for disabling join field row types (#12738)

### What?
This PR adds a new `admin.disableRowTypes` config to `'join'` fields
which hides the `"Type"` column from the relationship table.

### Why?
While the collection type column _can be_ helpful for providing
information, it's not always necessary and can sometimes be redundant
when the field only has a singular relationTo. Hiding it can be helpful
by removing visual noise and providing editors the data directly.

### How?
By threading `admin.disableRowTypes` directly to the `getTableState`
function of the `RelationshipTable` component.

**With row types** (via `admin.disableRowTypes: false | undefined` OR
default for polymorphic):

![image](https://github.com/user-attachments/assets/22b55477-cf56-4b0e-a845-e6f2b39efe3b)

**Without row types** (default for monomorphic):

![image](https://github.com/user-attachments/assets/3a2bb0ba-2d5e-4299-8689-249b2d3fefe2)

test/joins/config.ts

@@ -277,7 +277,6 @@ export default buildConfigWithDefaults({
         },
       ],
     },
-
     {
       slug: 'folders',
       fields: [