feat: Add assistant filter support to documents page (#10697)

This PR introduces support for an assistant filter on the documents page.

- Moved the existing assistant filter functionality to a standalone, reusable component.
- Updated the documents page and responses page to use the component

app/javascript/dashboard/api/captain/document.js

@@ -6,11 +6,12 @@ class CaptainDocument extends ApiClient {
     super('captain/documents', { accountScoped: true });
   }
 
-  get({ page = 1, searchKey } = {}) {
+  get({ page = 1, searchKey, assistantId } = {}) {
     return axios.get(this.url, {
       params: {
         page,
         searchKey,
+        assistant_id: assistantId,
       },
     });
   }