FEAT: Alpine Support

[bewithgaurav]

Work Item / Issue Reference

AB#34985

GitHub Issue: #<ISSUE_NUMBER>

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Summary

Introducing Alpine Support

[Copilot]

Pull Request Overview

This PR adds Alpine Linux support to the mssql-python library by resolving circular import issues that occurred during module initialization on Alpine's musl-based system. The key change moves driver path resolution from Python to C++ to avoid importing Python helpers during critical initialization phases.

• Implemented C++ driver path resolution to replace Python-based approach
• Added Alpine Linux distribution detection and driver loading support
• Included comprehensive Alpine ARM64 testing pipeline with containerized environment

Reviewed Changes

Copilot reviewed 4 out of 7 changed files in this pull request and generated 5 comments.

File	Description
mssql_python/pybind/ddbc_bindings.cpp	Replaced Python-based driver path resolution with pure C++ implementation including Alpine detection
mssql_python/helpers.py	Removed Python helper functions for driver path resolution and Linux distro detection
tests/test_000_dependencies.py	Updated tests to use new C++ driver path function and added Alpine detection logic
eng/pipelines/pr-validation-pipeline.yml	Added Alpine ARM64 testing pipeline and renamed existing Linux jobs for clarity