[Bug] SharePoint Toolkit Permissions Error for External SharePoint Sites

[epamLDadayan]

🐛 Steps to reproduce:

1. Configure SharePoint toolkit with external SharePoint site credentials. ( not epam)
2. Ensure the following permissions are set:
   • <AppPermissionRequests AllowAppOnlyPolicy="true"> <AppPermissionRequest Scope="http://sharepoint/content/sitecollection" Right="Read" /> </AppPermissionRequests>
3. Ensure API permissions are configured as per the provided screenshot.

4. Attempt to connect to the external SharePoint site using the toolkit.

Actual results:

• The system returns an "insufficient permissions" error despite proper configuration.
• Users are unable to connect and read information from external SharePoint sites.

Expected results:

• SharePoint toolkit should successfully connect to properly configured external SharePoint sites.
• Users should be able to read and index content from external SharePoint instances.
• Clear error messages should guide users on proper permission setup if required.

Additional Context:

• Users are able to retrieve files using API requests with the https://graph.microsoft.com/.default scope when obtaining token.
• Example toolkit https://dev.elitea.ai/alita_ui/18/toolkits/all/260?name=sharepoint_5clkvm

[epamLDadayan]

@SamvelSimonyan please check it tomorrow.

[SamvelSimonyan]

1. For rest api , all folders with files in them are displayed in the default documents folder
   For the graph api , only the first layer of files and folders are displayed in the default documents folder

2.For rest api following path is applied to get files via LLM sites/ALITA/Shared Documents/new/excel.xlsx
For the graph api, not we need to use new/excel.xlsx

3. Display all folders on the default document layer for the graph api