V2 centralize relation optimistic logic (#15552)

# Introduction
This PR aims to deprecate having to manually handle optimistic side
effect foreign key addition in the whole v2 experience.
This PR implements the strong basis + builder refactor of the optimistic
computation of a given flat entity maps with its related flat entity
maps ( runner needs a small refactor on actions type definition first )
Flat entity maps updates through mutations are now only scoped to the
generic entity builder ( very isolated )

## What's next
- Refactor actions v2 type definition to gain grain over `metadataName`
and action operation ( `create` `delete` `update` ).
from `{type: 'create_view_field'}` to `{metadataName: 'view_field',
type: 'create' }`
- Use new optimistic tool computation tools
- Only invalidate impacted flat maps cache

## New tools
Strictly dynamically typed new flat entity maps tools
- `addFlatEntityToFlatEntityAndRelatedEntityMapsThroughMutationOrThrow`
-
`deleteFlatEntityFromFlatEntityAndRelatedEntityMapsThroughMutationOrThrow`

## Unit test
Adding basic unit testing coverage to introduced tools

## `FlatEntityValidationArgs`
From 
```ts
export type FlatEntityValidationArgs<T extends AllMetadataName> = {
  flatEntityToValidate: MetadataFlatEntity<T>;
  optimisticFlatEntityMaps: MetadataFlatEntityMaps<T>;
  mutableDependencyOptimisticFlatEntityMaps: MetadataValidationRelatedFlatEntityMaps<T>;
  workspaceId: string;
  remainingFlatEntityMapsToValidate: MetadataFlatEntityMaps<T>;
  buildOptions: WorkspaceMigrationBuilderOptions;
};

```

To
```ts
export type FlatEntityValidationArgs<T extends AllMetadataName> = {
  flatEntityToValidate: MetadataFlatEntity<T>;
  optimisticFlatEntityMapsAndRelatedFlatEntityMaps: MetadataFlatEntityAndRelatedFlatEntityMapsForValidation<T>;
  workspaceId: string;
  remainingFlatEntityMapsToValidate: MetadataFlatEntityMaps<T>;
  buildOptions: WorkspaceMigrationBuilderOptions;
};

```

packages/twenty-server/src/engine/core-modules/serverless/drivers/interfaces/serverless-driver.interface.ts

@@ -1,5 +1,5 @@
-import { type ServerlessFunctionEntity } from 'src/engine/metadata-modules/serverless-function/serverless-function.entity';
 import { type ServerlessFunctionExecutionStatus } from 'src/engine/metadata-modules/serverless-function/dtos/serverless-function-execution-result.dto';
+import { type ServerlessFunctionEntity } from 'src/engine/metadata-modules/serverless-function/serverless-function.entity';
 
 export type ServerlessExecuteError = {
   errorType: string;
@@ -15,6 +15,7 @@ export type ServerlessExecuteResult = {
   error?: ServerlessExecuteError;
 };
 
+// TODO refactor to be using FlatServerlessFunction
 export interface ServerlessDriver {
   delete(serverlessFunction: ServerlessFunctionEntity): Promise<void>;
   execute(