refactor(schema): reorganize IndexField and related types (#22439)

## Summary

Querying `indexMetadatas { indexFieldMetadatas { ... } }` on the
`/metadata` GraphQL endpoint fails with a 500:

> Nest could not find IndexFieldMetadataDTOAuthorizer element (this
provider does not
> exist in the current context)

The `@CursorConnection('indexFieldMetadatas', ...)` decorator on
`IndexMetadataDTO` makes nestjs-query auto-generate a relation resolver
that injects an authorizer for `IndexFieldMetadataDTO`. That authorizer
is never provided, because the DTO was never registered as a resolver in
`IndexMetadataModule` — so the field has been broken since it was
introduced in #7162.

Since the working, DataLoader-backed `indexFieldMetadataList` field
already exposes the same data (and is what the frontend uses), this PR
removes the dead connection instead of wiring up the authorizer.

## Changes

- Remove `@CursorConnection('indexFieldMetadatas', ...)` from
`IndexMetadataDTO`
- Regenerate frontend metadata GraphQL types
(`twenty-front/src/generated-metadata`)
- Regenerate client SDK metadata schema/types
(`twenty-client-sdk/src/metadata/generated`)

## Notes

- Not a breaking change in practice: the removed field always threw, so
no consumer can have been relying on it. Callers now get a standard
GraphQL validation error suggesting `indexFieldMetadataList` instead of
an internal server error.
- Verified locally: the failing query now returns `Cannot query field
"indexFieldMetadatas" on type "Index". Did you mean
"indexFieldMetadataList"?` and `indexFieldMetadataList` continues to
work.

Fixes [sonarly issue #54098](https://sonarly.com/issue/54098?type=bug)

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packages/twenty-client-sdk/src/metadata/generated/schema.graphql

@@ -529,15 +529,6 @@ enum FieldMetadataType {
   UUID
 }
 
-type IndexField {
-  id: UUID!
-  fieldMetadataId: UUID!
-  order: Float!
-  subFieldName: String
-  createdAt: DateTime!
-  updatedAt: DateTime!
-}
-
 type Index {
   id: UUID!
   name: String!
@@ -555,13 +546,6 @@ type Index {
     """Specify to filter the records returned."""
     filter: ObjectFilter! = {}
   ): IndexObjectMetadataConnection!
-  indexFieldMetadatas(
-    """Limit or page results."""
-    paging: CursorPaging! = {first: 10}
-
-    """Specify to filter the records returned."""
-    filter: IndexFieldFilter! = {}
-  ): IndexIndexFieldMetadatasConnection!
 }
 
 """Type of the index"""
@@ -622,13 +606,6 @@ input BooleanFieldComparison {
   isNot: Boolean
 }
 
-input IndexFieldFilter {
-  and: [IndexFieldFilter!]
-  or: [IndexFieldFilter!]
-  id: UUIDFilterComparison
-  fieldMetadataId: UUIDFilterComparison
-}
-
 type ObjectStandardOverrides {
   labelSingular: String
   labelPlural: String
@@ -2021,6 +1998,15 @@ enum RelationType {
   MANY_TO_ONE
 }
 
+type IndexField {
+  id: UUID!
+  fieldMetadataId: UUID!
+  order: Float!
+  subFieldName: String
+  createdAt: DateTime!
+  updatedAt: DateTime!
+}
+
 type IndexEdge {
   """The node containing the Index"""
   node: Index!
@@ -2051,22 +2037,6 @@ type IndexConnection {
   edges: [IndexEdge!]!
 }
 
-type IndexFieldEdge {
-  """The node containing the IndexField"""
-  node: IndexField!
-
-  """Cursor for this node."""
-  cursor: ConnectionCursor!
-}
-
-type IndexIndexFieldMetadatasConnection {
-  """Paging information"""
-  pageInfo: PageInfo!
-
-  """Array of edges."""
-  edges: [IndexFieldEdge!]!
-}
-
 type ObjectEdge {
   """The node containing the Object"""
   node: Object!