[tests-only][full-ci]add test to upload folder via drag-n-drop

[prashant-gurung899]

Description

This PR adds test to upload folder and its files/subfolders via drag-n-drop.

Related Issue

• Related to : Write smoke tests for drag&drop upload #6051

Motivation and Context

How Has This Been Tested?

• locally

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Technical debt
• Tests
• Documentation
• Maintenance (e.g. dependency updates or tooling)

Open tasks:

• ...

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