feat(server): trigger workspace embedding (#12328)

fix AI-127

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

- **New Features**
  - Added automated event handling for workspace updates and document embedding, streamlining document embedding workflows.
  - Introduced detection and queuing of documents needing embedding, excluding ignored documents.
- **Improvements**
  - Enhanced performance of embedding-related searches by filtering results at the database level.
  - Increased concurrency for embedding job processing to improve throughput.
- **Bug Fixes**
  - Improved error handling and fallback for missing document titles during embedding.
  - Added safeguards to skip invalid embedding jobs based on document identifiers.
- **Tests**
  - Expanded test coverage for document embedding and ignored document filtering.
  - Updated end-to-end tests to use dynamic content for improved reliability.
  - Added synchronization waits in document creation utilities to improve test stability.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

.docker/selfhost/schema.json

@@ -48,14 +48,14 @@
         },
         "queues.copilot": {
           "type": "object",
-          "description": "The config for copilot job queue\n@default {\"concurrency\":1}",
+          "description": "The config for copilot job queue\n@default {\"concurrency\":5}",
           "properties": {
             "concurrency": {
               "type": "number"
             }
           },
           "default": {
-            "concurrency": 1
+            "concurrency": 5
           }
         },
         "queues.doc": {