Val/988 add mstest4 configuration

[ValentinaPetrova]

• add MSTest4 resolver
• create a base class for all mstest resolvers
• add MSTest 4 assembly to TestMethodEmitter.cpp
• change lock scope in HierarchicalTestFrameworkContextResolver

closes telerik/MATTeam#988

[Copilot]

Pull Request Overview

This PR adds support for MSTest version 4 to the JustMock framework by creating a base class abstraction for all MSTest resolvers and introducing a new MSTestV4 resolver. The changes consolidate duplicate code and extend test framework compatibility.

Key Changes:

• Created a new base class MSTestBaseMockingContextResolver to consolidate common MSTest logic
• Added MSTestV4MockingContextResolver for MSTest 4 support
• Optimized lock scope in HierarchicalTestFrameworkContextResolver by moving non-critical operations outside the lock

Reviewed Changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
MockingContext.cs	Registers the new MSTestV4 resolver
MSTestV4MockingContextResolver.cs	New resolver implementation for MSTest 4 framework
MSTestV2MockingContextResolver.cs	Refactored to inherit from base class, removing duplicated code
MSTestMockingContextResolver.cs	Refactored to inherit from base class, removing duplicated code
MSTestBaseMockingContextResolver.cs	New base class containing shared MSTest resolver logic
HierarchicalTestFrameworkContextResolver.cs	Lock scope optimization using environment variable flag

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