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/collections/Categories.ts

@@ -4,6 +4,7 @@ import { ValidationError } from 'payload'
 
 import { categoriesSlug, hiddenPostsSlug, postsSlug } from '../shared.js'
 import { singularSlug } from './Singular.js'
+import { versionsSlug } from './Versions.js'
 
 export const Categories: CollectionConfig = {
   slug: categoriesSlug,
@@ -55,6 +56,7 @@ export const Categories: CollectionConfig = {
           beforeInput: ['/components/BeforeInput.js#BeforeInput'],
           Description: '/components/CustomDescription/index.js#FieldDescriptionComponent',
         },
+        disableRowTypes: false,
       },
       collection: postsSlug,
       defaultSort: '-title',
@@ -62,6 +64,14 @@ export const Categories: CollectionConfig = {
       on: 'category',
       maxDepth: 1,
     },
+    {
+      name: 'noRowTypes',
+      type: 'join',
+      collection: postsSlug,
+      defaultLimit: 5,
+      on: 'category',
+      maxDepth: 1,
+    },
     {
       name: 'hasManyPosts',
       type: 'join',
@@ -95,6 +105,7 @@ export const Categories: CollectionConfig = {
           on: 'group.category',
           admin: {
             defaultColumns: ['id', 'createdAt', 'title'],
+            disableRowTypes: false,
           },
         },
         {
@@ -129,6 +140,21 @@ export const Categories: CollectionConfig = {
       collection: 'posts',
       on: 'blocks.category',
     },
+    {
+      name: 'polymorphicJoin',
+      type: 'join',
+      collection: [postsSlug, versionsSlug],
+      on: 'category',
+    },
+    {
+      name: 'polymorphicJoinNoRowTypes',
+      type: 'join',
+      collection: [postsSlug, versionsSlug],
+      on: 'category',
+      admin: {
+        disableRowTypes: true,
+      },
+    },
     {
       name: 'polymorphic',
       type: 'join',