Automate Roslyn Dependency Management with Darc & Prune Direct References

[T-Gro]

This PR transitions Roslyn dependencies from manual version management to automated updates via darc subscriptions, simplifying ongoing maintenance and improving reliability. The main changes include:

• Migrating Roslyn package versions to be managed by darc auto-subscriptions.
• Fixing API compatibility issues stemming from Roslyn updates.
• Updating the test framework to eliminate hardcoded dependency versions.
• Writing and running a script to prune direct package references that are already covered by transitive dependencies and not directly used.
• Cleaning up Versions.props by removing unnecessary package version entries.

By ensuring that only necessary and directly-used packages are referenced, and letting darc handle version updates, this work reduces the likelihood of NuGet conflict errors and warnings caused by mismatched or redundant version specifications. The result is a more predictable build process, less manual intervention, and improved dependency hygiene for future updates.

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[Copilot]

Pull Request Overview

This PR modernizes dependency management by moving Roslyn and Visual Studio dependencies from manually managed versions to dependency auto-update flow control (darc). The change removes numerous hard-coded package references from project files and consolidates version management through centralized configuration files.

Key changes:

• Removes manually managed package references from Visual Studio integration projects
• Updates Versions.props with new version patterns and removes obsolete version variables
• Adds dependency tracking entries in Version.Details.xml for automated updates
• Updates test framework to dynamically read versions from Versions.props instead of using hard-coded values

Reviewed Changes

Copilot reviewed 17 out of 17 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
vsintegration/tests/UnitTests/VisualFSharp.UnitTests.fsproj	Removes 20+ manually managed Visual Studio package references
vsintegration/src/FSharp.Editor/FSharp.Editor.fsproj	Removes most Visual Studio package references, adds System.ComponentModel.Composition reference, changes EditorFeatures package
vsintegration/src/FSharp.LanguageService/ProjectSitesAndFiles.fs	Removes unused System.ComponentModel.Composition import
eng/Versions.props	Updates version variables for VS packages, removes obsolete RoslynVersion group
eng/Version.Details.xml	Adds dependency entries for Roslyn packages to enable darc management
tests/FSharp.Test.Utilities/TestFramework.fs	Updates to read compiler versions from Versions.props dynamically