feat(app-dev): surface metadata diff in dev sync and name failing migration actions (#21249)

Split out of #21240.

- Render the applied metadata changes (created/updated/deleted +
identifiers) in the dev sync output instead of a bare `✓ Synced`.
- Include the failing entity's `universalIdentifier` in
`WorkspaceMigrationRunnerException` messages so conflicts are
diagnosable.

<img width="637" height="114" alt="image"
src="https://github.com/user-attachments/assets/61422a16-370c-4e9b-a2f6-c29ce17f3b1b"
/>

<img width="497" height="104" alt="image"
src="https://github.com/user-attachments/assets/d493c398-da29-49c9-ac5e-aa0f26cd7389"
/>

<img width="593" height="127" alt="image"
src="https://github.com/user-attachments/assets/15e26edc-c0e4-4427-bd34-909040e970c9"
/>

---------

Co-authored-by: Charles Bochet <charles@twenty.com>

packages/twenty-server/src/engine/core-modules/application/application-development/dtos/workspace-migration.dto.ts

@@ -1,6 +1,7 @@
 import { Field, ObjectType } from '@nestjs/graphql';
 
 import GraphQLJSON from 'graphql-type-json';
+import { type SyncAction } from 'twenty-shared/metadata';
 
 @ObjectType('WorkspaceMigration')
 export class WorkspaceMigrationDTO {
@@ -8,5 +9,5 @@ export class WorkspaceMigrationDTO {
   applicationUniversalIdentifier: string;
 
   @Field(() => GraphQLJSON)
-  actions: unknown[];
+  actions: SyncAction[];
 }