Improve performance on metadata computation (#12785)

In this PR:

## Improve recompute metadata cache performance. We are aiming for
~100ms

Deleting relationMetadata table and FKs pointing on it
Fetching indexMetadata and indexFieldMetadata in a separate query as
typeorm is suboptimizing

## Remove caching lock

As recomputing the metadata cache is lighter, we try to stop preventing
multiple concurrent computations. This also simplifies interfaces

## Introduce self recovery mecanisms to recompute cache automatically if
corrupted

Aka getFreshObjectMetadataMaps

## custom object resolver performance improvement:  1sec to 200ms

Double check queries and indexes used while creating a custom object
Remove the queries to db to use the cached objectMetadataMap

## reduce objectMetadataMaps to 500kb
<img width="222" alt="image"
src="https://github.com/user-attachments/assets/2370dc80-49b6-4b63-8d5e-30c5ebdaa062"
/>

We used to stored 3 fieldMetadataMaps (byId, byName, byJoinColumnName).
While this is great for devXP, this is not great for performances.
Using the same mecanisme as for objectMetadataMap: we only keep byIdMap
and introduce two otherMaps to idByName, idByJoinColumnName to make the
bridge

## Add dataloader on IndexMetadata (aka indexMetadataList in the API)

## Improve field resolver performances too

## Deprecate ClientConfig

packages/twenty-front/src/modules/object-metadata/graphql/queries.ts

@@ -25,29 +25,14 @@ export const FIND_MANY_OBJECT_METADATA_ITEMS = gql`
           isLabelSyncedWithName
           isSearchable
           duplicateCriteria
-          indexMetadatas(paging: { first: 100 }) {
-            edges {
-              node {
-                id
-                createdAt
-                updatedAt
-                name
-                indexWhereClause
-                indexType
-                isUnique
-                indexFieldMetadatas(paging: { first: 100 }) {
-                  edges {
-                    node {
-                      id
-                      createdAt
-                      updatedAt
-                      order
-                      fieldMetadataId
-                    }
-                  }
-                }
-              }
-            }
+          indexMetadataList {
+            id
+            createdAt
+            updatedAt
+            name
+            indexWhereClause
+            indexType
+            isUnique
           }
           fieldsList {
             id

packages/twenty-front/src/modules/object-metadata/types/ObjectMetadataItem.ts

@@ -11,6 +11,7 @@ export type ObjectMetadataItem = Omit<
   | 'indexMetadatas'
   | 'labelIdentifierFieldMetadataId'
   | 'fieldsList'
+  | 'indexMetadataList'
 > & {
   __typename?: string;
   fields: FieldMetadataItem[];

packages/twenty-front/src/modules/object-metadata/utils/mapPaginatedObjectMetadataItemsToObjectMetadataItems.ts

@@ -1,3 +1,4 @@
+import { IndexMetadataItem } from '@/object-metadata/types/IndexMetadataItem';
 import { objectMetadataItemSchema } from '@/object-metadata/validation-schemas/objectMetadataItemSchema';
 import { ObjectMetadataItemsQuery } from '~/generated-metadata/graphql';
 import { ObjectMetadataItem } from '../types/ObjectMetadataItem';
@@ -14,19 +15,21 @@ export const mapPaginatedObjectMetadataItemsToObjectMetadataItems = ({
           object.node.labelIdentifierFieldMetadataId,
         );
 
-      const { fieldsList, ...objectWithoutFieldsList } = object.node;
+      const { fieldsList, indexMetadataList, ...objectWithoutFieldsList } =
+        object.node;
 
       return {
         ...objectWithoutFieldsList,
         fields: fieldsList,
         labelIdentifierFieldMetadataId,
-        indexMetadatas: object.node.indexMetadatas?.edges.map((index) => ({
-          ...index.node,
-          indexFieldMetadatas: index.node.indexFieldMetadatas?.edges.map(
-            (indexField) => indexField.node,
-          ),
-        })),
-      };
+        indexMetadatas: indexMetadataList.map(
+          (index) =>
+            ({
+              ...index,
+              indexFieldMetadatas: [],
+            }) satisfies IndexMetadataItem,
+        ),
+      } satisfies ObjectMetadataItem;
     }) ?? [];
 
   return formattedObjects;