📎 fix: Document Uploads for Custom Endpoints (#10336)

* Fixed upload to provider for custom endpoints + unit tests

* fix: add support back for agents to be able to use Upload to Provider with supported providers

* ci: add test for agents endpoint still recognizing document supported providers

* chore: address ESLint suggestions

* Improved unit tests

* Linting error on unit tests fixed

---------

Co-authored-by: Dustin Healy <dustinhealy1@gmail.com>

client/src/components/Chat/Input/Files/AttachFileMenu.tsx

@@ -117,8 +117,10 @@ const AttachFileMenu = ({
       const items: MenuItemProps[] = [];
 
       const currentProvider = provider || endpoint;
-
-      if (isDocumentSupportedProvider(currentProvider || endpointType)) {
+      if (
+        isDocumentSupportedProvider(endpointType) ||
+        isDocumentSupportedProvider(currentProvider)
+      ) {
         items.push({
           label: localize('com_ui_upload_provider'),
           onClick: () => {