Refactor workspace migration runner exception handling (#17310)

# Introduction
In this PR we catch all the runner errors coming from a single workspace
migration action execution.

**1. `WorkspaceMigrationActionExecutionException`** (low-level,
action-specific)
- Thrown from action handlers, utils, and helper functions
- Contains specific error codes: `FIELD_METADATA_NOT_FOUND`,
`OBJECT_METADATA_NOT_FOUND`, `ENUM_OPERATION_FAILED`, `NOT_SUPPORTED`,
etc.
- Simple structure: `message`, `code`, `userFriendlyMessage`
- No action context - just describes what went wrong

**2. `WorkspaceMigrationRunnerException`** (high-level, runner-scoped)
- Only two codes: `INTERNAL_SERVER_ERROR` and `EXECUTION_FAILED`
- `EXECUTION_FAILED` **requires** `action` + `errors` (contains the
action context)
- `INTERNAL_SERVER_ERROR` **requires** `message` (no action context)

## Refactor
- Removed the `relatedFlatEntityMapsKeys` from the `WorkspaceMigration`
type as they're directly inferred from passed actions
- Swallowing actions rollbacks errors in order to iterate over all of
them

## Testing
Created a very straigthforward install application from workspace
migration endpoint in order to start testing the introduced
`WorkspaceMigrationActionExecutionException`
Introduced a feature flag that stop the access to the endpoint if not
enabled
Whole taken direction are totally subjective and highly prone to
mutations ( endpoint location, naming and input schema see
`ts-expect-error` comment )
cc @martmull 

## Response error
```ts
{
  "eventId": "evt_a1b2c3d4-5678-90ab-cdef-1234567890ab",
  "extensions": {
    "action": {
      "metadataName": "fieldMetadata",
      "type": "delete",
      "universalIdentifier": "20202020-6110-4547-9fd0-2525257a2c3f"
    },
    "code": "APPLICATION_INSTALLATION_FAILED",
    "errors": {
      "metadata": {
        "code": "ENTITY_NOT_FOUND",
        "message": "Could not find flat entity with universal identifier 20202020-6110-4547-9fd0-2525257a2c3f"
      },
      "workspaceSchema": {
        "code": "ENTITY_NOT_FOUND",
        "message": "Could not find flat entity in maps"
      }
    },
    "exceptionEventId": "exc_f9e8d7c6-5432-10ba-fedc-ba0987654321",
    "userFriendlyMessage": "Migration execution failed."
  },
  "message": "Migration action 'delete' for 'fieldMetadata' failed",
  "name": "GraphQLError"
}
```

packages/twenty-server/src/engine/metadata-modules/command-menu-item/command-menu-item.module.ts

@@ -7,7 +7,7 @@ import { CommandMenuItemService } from 'src/engine/metadata-modules/command-menu
 import { CommandMenuItemGraphqlApiExceptionInterceptor } from 'src/engine/metadata-modules/command-menu-item/interceptors/command-menu-item-graphql-api-exception.interceptor';
 import { FlatCommandMenuItemModule } from 'src/engine/metadata-modules/flat-command-menu-item/flat-command-menu-item.module';
 import { WorkspaceManyOrAllFlatEntityMapsCacheModule } from 'src/engine/metadata-modules/flat-entity/services/workspace-many-or-all-flat-entity-maps-cache.module';
-import { WorkspaceMigrationBuilderGraphqlApiExceptionInterceptor } from 'src/engine/workspace-manager/workspace-migration/interceptors/workspace-migration-builder-graphql-api-exception.interceptor';
+import { WorkspaceMigrationGraphqlApiExceptionInterceptor } from 'src/engine/workspace-manager/workspace-migration/interceptors/workspace-migration-graphql-api-exception.interceptor';
 import { WorkspaceMigrationModule } from 'src/engine/workspace-manager/workspace-migration/workspace-migration.module';
 
 @Module({
@@ -22,7 +22,7 @@ import { WorkspaceMigrationModule } from 'src/engine/workspace-manager/workspace
     CommandMenuItemService,
     CommandMenuItemResolver,
     CommandMenuItemGraphqlApiExceptionInterceptor,
-    WorkspaceMigrationBuilderGraphqlApiExceptionInterceptor,
+    WorkspaceMigrationGraphqlApiExceptionInterceptor,
   ],
   exports: [CommandMenuItemService],
 })