refactor(server): updates merge delay reduced to 5 seconds (#13138)

close AF-2733



#### PR Dependency Tree


* **PR #13138** 👈

This tree was auto-generated by
[Charcoal](https://github.com/danerwilliams/charcoal)

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

* **Refactor**
* Reduced the delay for merging pending document updates from 30 seconds
to 5 seconds, resulting in faster update processing.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

packages/backend/server/src/core/doc/adapters/workspace.ts

@@ -100,7 +100,7 @@ export class PgWorkspaceDocStorageAdapter extends DocStorageAdapter {
             {
               // keep it simple to let all update merged in one job
               jobId: `doc:merge-pending-updates:${workspaceId}:${docId}`,
-              delay: 30 * 1000 /* 30s */,
+              delay: 5 * 1000 /* 5s */,
               priority: 100,
             }
           );