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 -->

packages/frontend/core/src/components/page-list/selector/selector-layout.tsx

@@ -44,9 +44,10 @@ export const SelectorLayout = ({
   );
 
   return (
-    <div className={styles.root}>
+    <div className={styles.root} data-testid="doc-selector-layout">
       <header className={styles.header}>
         <RowInput
+          data-testid="doc-selector-search-input"
           className={styles.search}
           placeholder={searchPlaceholder}
           onChange={onSearchChange}
@@ -73,10 +74,15 @@ export const SelectorLayout = ({
         <div className={styles.footerAction}>
           {actions ?? (
             <>
-              <Button onClick={onCancel} className={styles.actionButton}>
+              <Button
+                data-testid="doc-selector-cancel-button"
+                onClick={onCancel}
+                className={styles.actionButton}
+              >
                 {t['Cancel']()}
               </Button>
               <Button
+                data-testid="doc-selector-confirm-button"
                 onClick={onConfirm}
                 className={styles.actionButton}
                 variant="primary"