test(FN-4313): complete Step 2 — add project engine id accessor

Fusion-Task-Id: FN-4313
Fusion-Task-Lineage: 36b8aad3-20f4-475b-9b0f-63e5458d1b91

packages/engine/src/project-engine.ts

@@ -626,6 +626,11 @@ export class ProjectEngine {
     return this.config.workingDirectory;
   }
 
+  /** Get the project id. */
+  getProjectId(): string {
+    return this.config.projectId;
+  }
+
   /** Get the PrMonitor (if initialized). */
   getPrMonitor(): PrMonitor | undefined {
     return this.prMonitor;