On selecting the Install button under "Package Required - 2D Sprite Editor" pop up, it redirects to Webpage instead of installing a package from Package Manager, Refer to the attached video.

Steps to repro:
1. Create a new project
2. Window > UI Toolkit > UI Builder
3. Library > Button > right-click > Add
4. Inspector > Background > Image > Select Sprite option from dropdown
5. Select Open in Sprite Editor
6. "Package required - 2D Sprite Editor" pop up > Install > click

Actual Result:
When the Install button is selected from "Package required - 2D Sprite Editor" pop up, it redirects to the webpage instead of installing the package from Package Manager

Expected Result:
2D Sprite Editor package should be installed by selecting the Install button from the "Package required - 2D Sprite Editor" pop up

Note:
1. Texture and Sprite options dropdown introduced in 2021.1.0a5
2. UI toolkit is core package onwards 2021.1.0a5

Reproducible in:
2021.1.0a6, 2021.1.0a5

Environment:
Occurring on Windows 10 & macOS 10.15.