Bump test dependencies to resolve System.Net.Http vulnerability, update workflows and README

[priya-kinthali]

Description:
This PR includes:

• Bumps test dependencies in __tests__/e2e-test-csproj/test.csproj to their latest available versions:

  • Microsoft.NET.Test.Sdk from 15.5.0-preview-20170810-02 to 18.0.1.
  • MSTest.TestAdapter from 1.1.18 to 4.0.2.
  • MSTest.TestFramework from 1.1.18 to 4.0.2.

• Updates workflow configuration for improved clarity and removes references to older .NET versions.

• Updates the README:

  • Removes references for deprecated .NET versions.
  • Bumps actions/checkout from 5 to 6.
  • Adds a note recommending the use of pwsh or bash when generating a temporary global.json on Windows to avoid formatting issues.

Related issues:
#676
#683

Check list:

• Mark if documentation changes are required.
• Mark if tests were added or updated to cover the changes.

[Copilot]

Pull request overview

This PR addresses a security vulnerability (CVE-2018-8292) in the transitive dependency System.Net.Http 4.3.0 by upgrading test dependencies to their latest versions, and resolves documentation issues related to Windows CMD shell formatting of global.json files. The changes include comprehensive version updates throughout test files and workflows to use .NET 8.0, 9.0, and 10.0.

Key Changes:

• Upgraded test dependencies: Microsoft.NET.Test.Sdk to 18.0.1, MSTest.TestAdapter and MSTest.TestFramework to 4.0.2, successfully eliminating the System.Net.Http 4.3.0 vulnerability
• Updated all test files and workflows from .NET 6.0/7.0 references to 9.0/10.0 for current relevance
• Consolidated workflow test jobs to reduce duplication while maintaining comprehensive coverage across all supported operating systems
• Added documentation note about Windows shell requirements for global.json generation

Reviewed changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
__tests__/e2e-test-csproj/test.csproj	Updated test dependencies to latest secure versions (Microsoft.NET.Test.Sdk 18.0.1, MSTest packages 4.0.2)
__tests__/e2e-test-csproj/packages.lock.json	Regenerated lock file with updated dependencies targeting net10.0, removing vulnerable System.Net.Http 4.3.0
__tests__/e2e-test-csproj/Test.cs	Fixed assertion parameter order to follow MSTest conventions (expected, actual)
__tests__/e2e-test-csproj/AssemblyInfo.cs	Added DoNotParallelize attribute for sequential test execution
__tests__/verify-dotnet.ps1	Added support for .NET 10.0 framework mapping
__tests__/setup-dotnet.test.ts	Updated test version references from 6.0 to 10.0
__tests__/installer.test.ts	Updated test version references from 3.1/6.0 to 10.0 for consistency
README.md	Updated actions/checkout from v5 to v6, version examples to 8.0/9.0/10.0, and added Windows shell guidance
.github/workflows/test-dotnet.yml	Updated matrix to test .NET 8.0, 9.0, 10.0 instead of 6.0, 7.0, 8.0, 9.0
.github/workflows/e2e-tests.yml	Consolidated test jobs and updated versions to 9.0/10.0, expanding OS matrix to include ubuntu-latest and macos-latest

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