feat(server): skip embedding for deprecated doc ids & empty docs (#13211)

fix AI-367

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

* **Bug Fixes**
* Improved document filtering to exclude settings documents and empty
blobs from embedding and status calculations.
* Enhanced embedding jobs to skip processing deprecated documents if a
newer version exists, ensuring only up-to-date documents are embedded.
* **New Features**
* Added a mutation to trigger the cron job for generating missing
titles.
* **Tests**
* Added test to verify exclusion of documents with empty content from
embedding.
* Updated embedding-related tests to toggle embedding state during
attachment upload under simulated network conditions.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

packages/backend/server/src/plugins/copilot/resolver.ts

@@ -844,7 +844,7 @@ export class PromptsManagementResolver {
     private readonly promptService: PromptService
   ) {}
 
-  @Query(() => Boolean, {
+  @Mutation(() => Boolean, {
     description: 'Trigger generate missing titles cron job',
   })
   async triggerGenerateTitleCron() {