A minor adjustement in UnreferenceDisposable so that it's smaller. UnreferenceDisposable had two references previously. One for the session, one for the time provider. Now it has one so whenever UnreferenceDisposable is created for scoping, the allocated object has one less reference to capture.

Motivation and Context

Going through the project and finding optimization opportunities.

How Has This Been Tested?

Locally, unit tests.

Breaking Changes

Nope

Types of changes

• Optimization
• 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)
• Documentation update

Checklist

• I have read the MCP Documentation
• My code follows the repository's style guidelines
• New and existing tests pass locally
• I have added appropriate error handling
• I have added or updated documentation as needed