Swap outer and inner loops in write_python_part()

[e-nomem]

Of the two loops (walking the directory tree and iterating over the python packges), the directory traversal is the more expensive one. It should be the outer loop so we only do it once.

[Copilot]

Pull Request Overview

This PR optimizes the write_python_part() function by reversing the loop nesting order to perform expensive directory traversal only once instead of once per Python package.

Key Changes:

• Moved directory tree traversal (WalkBuilder) to the outer loop
• Changed the package filtering logic from checking a single package to using .any() to check against all packages
• Reduced the number of directory tree walks from N (number of packages) to 1