CmdPal: Add AutomationProperties.Name to Extensions page "More" button (#45516)

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## Summary of the Pull Request
Add an AutomationProperties.Name to the "More options" button on the
CmdPal Settings Extensions page, improving accessibility for screen
readers. Add localized AutomationProperties.Name ("More options") for
the Settings_ExtensionsPage_More_Button in Resources.resw

This address A11y bug 60946859

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- [ ] Closes: #xxx
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- [ ] **Tests:** Added/updated and all pass
- [ ] **Localization:** All end-user-facing strings can be localized
- [ ] **Dev docs:** Added/updated
- [ ] **New binaries:** Added on the required places
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- [ ] [WXS for
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https://github.com/user-attachments/assets/9cd5f580-bf7d-4dd1-9344-96f6c51c7958

src/modules/cmdpal/Microsoft.CmdPal.UI/Strings/en-us/Resources.resw

@@ -774,4 +774,7 @@ Right-click to remove the key combination, thereby deactivating the shortcut.</v
   <data name="Settings_AppearancePage_ResetAppearanceButton_Text.Text" xml:space="preserve">
     <value>Reset to defaults</value>
   </data>
+  <data name="Settings_ExtensionsPage_More_Button.[using:Microsoft.UI.Xaml.Automation]AutomationProperties.Name" xml:space="preserve">
+    <value>More options</value>
+  </data>
 </root>