REFACTOR: Shift get_driver_path from Python to DDBC bindings with tests

[bewithgaurav]

Work Item / Issue Reference

AB#38102

GitHub Issue: #<ISSUE_NUMBER>

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Summary

This pull request refactors the ODBC driver path resolution logic to be implemented entirely in C++ instead of Python. The main motivation is to eliminate a circular import issue that caused failures on Alpine Linux due to musl libc's stricter dynamic loading rules. The Python helper and its associated test have been removed, and equivalent logic is now handled in C++. The test suite has been updated to validate the new C++-based resolution.

Refactor: Move driver path resolution to C++

• Removed the get_driver_path function from mssql_python/helpers.py, eliminating Python-based driver path resolution.
• Implemented GetDriverPathCpp in mssql_python/pybind/ddbc_bindings.cpp to handle all platform and architecture-specific ODBC driver path resolution in C++. This avoids Python dependencies during module initialization and resolves the Alpine Linux circular import issue. [1] [2]
• Updated the C++ Python bindings to expose GetDriverPathCpp instead of the removed Python function.

Testing updates

• Removed tests for the old Python helper and added a new test to validate the C++ GetDriverPathCpp function against expected driver paths derived in Python. [1] [2]
• Added helper imports and a method to compute the expected driver path in the test suite for accurate cross-validation. [1] [2]

[Copilot]

Pull Request Overview

This pull request refactors ODBC driver path resolution from Python to C++ to eliminate circular import issues on Alpine Linux caused by musl libc's stricter dynamic loading rules.

• Removed the Python get_driver_path function from helpers.py and implemented equivalent logic in C++ (GetDriverPathCpp)
• Updated C++ bindings to use the new C++ implementation instead of calling Python helpers during module initialization
• Modified test suite to validate the new C++ driver path resolution against expected paths

Reviewed Changes

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

File	Description
mssql_python/helpers.py	Removed the Python get_driver_path function
mssql_python/pybind/ddbc_bindings.cpp	Added C++ GetDriverPathCpp implementation and updated module bindings
tests/test_000_dependencies.py	Replaced Python helper test with C++ function validation test

[gargsaumya]

LGTM