Separately run macOS tests to avoid failures due to lack of Docker

[skarpovdev]

Motivation and Context

How Has This Been Tested?

Breaking Changes

Types of changes

• 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

Additional context

[Copilot]

Pull Request Overview

This PR modifies the test infrastructure to use Docker containers for running TypeScript SDK tests, specifically addressing Docker compatibility issues on macOS by separating test execution into platform-specific jobs.

• Replaces local TypeScript SDK cloning and process execution with Docker-based test runners
• Updates CI workflow to run macOS tests separately from Docker-based JVM tests
• Refactors test utilities to use testcontainers library for better container management

Reviewed Changes

Copilot reviewed 10 out of 11 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
kotlin-sdk-test/src/jvmTest/kotlin/io/modelcontextprotocol/kotlin/sdk/integration/utils/Dockerfile	Adds Docker image definition for TypeScript SDK test environment
kotlin-sdk-test/src/jvmTest/kotlin/io/modelcontextprotocol/kotlin/sdk/integration/typescript/TsTestBase.kt	Major refactor replacing local process execution with Docker container management
kotlin-sdk-test/src/jvmTest/kotlin/io/modelcontextprotocol/kotlin/sdk/integration/typescript/sse/*.kt	Updates test classes to use new Docker-based infrastructure
kotlin-sdk-test/build.gradle.kts	Adds testcontainers dependency
gradle/libs.versions.toml	Adds testcontainers library version
.github/workflows/build.yml	Splits CI into separate macOS and Ubuntu jobs with different test strategies

---

_{Tip: Customize your code reviews with copilot-instructions.md. Create the file or learn how to get started.}