Fixes for compatibility with the latest version of TUnit

[thomhurst]

No description provided.

[martynas-m]

any estimates when this can be merged? currently we're stuck with quite old TUnit version, since updating breaks tests?

[thomhurst]

@martynas-m Need someone who maintains this repository 🤷‍♂️ It seems very inactive

[Copilot]

Pull request overview

This PR updates the Snapshooter.TUnit integration to be compatible with TUnit version 1.5.6, upgrading from version 0.10.6. The changes adapt to breaking API changes in TUnit's TestContext structure and remove obsolete namespace imports.

• Upgrades all TUnit package dependencies from 0.10.6 to 1.5.6
• Adapts TestContext API usage to the new structure with Metadata property
• Removes unused namespace import that no longer exists in the new TUnit version
• Adds LangVersion specification for consistency

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
test/Snapshooter.TUnit.Tests/TUnitAssertTests.cs	Removes obsolete TUnit.Assertions.AssertConditions.Throws namespace import that no longer exists in TUnit 1.5.6
test/Snapshooter.TUnit.Tests/Snapshooter.TUnit.Tests.csproj	Updates TUnit package reference from version 0.10.6 to 1.5.6
src/Snapshooter.TUnit/TUnitSnapshotFullNameReader.cs	Migrates TestContext API calls to use new Metadata.TestDetails structure, updating property paths for ClassType.Name, TestName, and TestMethodArguments
src/Snapshooter.TUnit/Snapshooter.TUnit.csproj	Updates TUnit.Assertions and TUnit.Core package references to version 1.5.6, and adds LangVersion>latest</LangVersion> property for consistency

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