Clarify licensing for `plugins/upgrade-agent` (`plugin.json` vs repository `LICENSE.md`)

Description

I noticed what appears to be a discrepancy and would appreciate some clarification on which license applies.

The plugins/upgrade-agent/plugin.json file declares:

"license": "MIT"

However, the repository's root LICENSE.md contains the Microsoft Pre-Release Software License Terms rather than the MIT License.

Additionally:

• plugin.json points to this repository as both the repository and homepage.
• There does not appear to be a separate LICENSE file under plugins/upgrade-agent/.

Question

Could you clarify which license applies to the upgrade-agent plugin?

If the plugin is intended to be MIT licensed, would it be possible to include the corresponding license file or documentation? Otherwise, if the repository's pre-release license is intended to apply, should the license field in plugin.json be updated accordingly?

This clarification would help users and compliance/license-scanning tools correctly determine the applicable license.

Thank you!

Start by comparing plugins/upgrade-agent/plugin.json with the repository root LICENSE.md, as described in the issue. Determine which license the plugin is intended to use and identify whether the metadata or accompanying documentation needs to match it. The work is done when the applicable license is clarified and the referenced files consistently communicate it.