feat(core): workspace embedding settings (#11801)

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

- **New Features**
  - Introduced "Indexer & Embedding" workspace settings to manage AI embedding for local content, including document ignoring and attachment uploads.
  - Added UI components for embedding settings, attachments, and ignored documents with pagination and deletion capabilities.
  - Provided comprehensive file-type icons for attachments.

- **Improvements**
  - Added a new tab for indexing and embedding in workspace settings navigation.
  - Included test identifiers on key UI elements to enhance automated testing.

- **Localization**
  - Added English localization strings covering all embedding-related UI text and actions.

- **Bug Fixes**
  - Enabled previously skipped end-to-end tests for embedding settings to improve reliability.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

.github/workflows/build-test.yml

@@ -1081,6 +1081,7 @@ jobs:
               - 'packages/backend/server/src/plugins/copilot/**'
               - 'packages/backend/server/tests/copilot.*'
               - 'packages/frontend/core/src/blocksuite/ai/**'
+              - 'packages/frontend/core/src/modules/workspace-indexer-embedding/**'
               - 'tests/affine-cloud-copilot/**'
 
       - name: Setup Node.js