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-server/src/engine/core-modules/event-emitter/types/object-record.base.event.ts

@@ -13,6 +13,6 @@ export class ObjectRecordBaseEvent<T = object> {
   recordId: string;
   userId?: string;
   workspaceMemberId?: string;
-  objectMetadata: ObjectMetadataInterface;
+  objectMetadata: Omit<ObjectMetadataInterface, 'indexMetadatas'>;
   properties: Properties<T>;
 }

packages/twenty-server/src/engine/core-modules/event-emitter/utils/__tests__/object-record-changed-values.spec.ts

@@ -4,6 +4,7 @@ import { objectRecordChangedValues } from 'src/engine/core-modules/event-emitter
 
 const mockObjectMetadata: ObjectMetadataInterface = {
   id: '1',
+  icon: 'Icon123',
   nameSingular: 'Object',
   namePlural: 'Objects',
   labelSingular: 'Object',