Remove BuildEngine project

[Jklawreszuk]

PR Details

Description

This PR removes an unused project. Previously in Xenko, it was used in BuildEngine.Tests and probably BuildEngine.Common, but this is no longer the case

Related Issue

Motivation and Context

Types of changes

• Refactoring / dependency upgrade
• 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)

Checklist

• My change requires a change to the documentation.
• I have added tests to cover my changes.
• All new and existing tests passed.
• I have built and run the editor to try this change out.