Add python tests to CI

[olaservo]

Description

Added automated testing support to the Python CI workflow to run pytest tests for Python MCP servers. The workflow now detects packages with tests and runs them .

Server Details

• Server: CI/CD Infrastructure (affects all 3 Python servers, although fetch doesn't appear to have any tests yet)
• Changes to: GitHub Actions workflow for Python packages

Motivation and Context

The repository lacked test automation for Python servers. This change ensures that:

• Python server tests are automatically run on every push and PR
• Tests must pass before packages are built and published

How Has This Been Tested?

• Verified the workflow detects Python packages correctly (git, time servers screenshots below)

Breaking Changes

No breaking changes. This is purely a CI/CD enhancement that doesn't affect server functionality or client configurations.

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 Protocol Documentation
• My changes follows MCP security best practices
• I have updated the server's README accordingly
• I have tested this with an LLM client
• My code follows the repository's style guidelines
• New and existing tests pass locally
• I have added appropriate error handling
• I have documented all environment variables and configuration options