Add py-files support for function python dependency management

[sarasavilli-sf]

Summary

This PR implements py-files based dependency management for function package type:

• Modifies build_native_dependencies.sh to install dependencies directly to py-files directory using pip install --target
• Adds validation to detect missing py-files directory (indicates build failure)
• Updates prepare_dependency_archive() to handle both script (tar.gz) and function (py-files) package types
• Refactors package type detection to CLI layer for cleaner separation of concerns

Changes

Core Implementation

• build_native_dependencies.sh: Changed from venv-pack to direct pip install to py-files directory
• deploy.py:
  • Updated prepare_dependency_archive() to accept package_type parameter
  • Added logic to handle function type (copy py-files) vs script type (copy tar.gz)
  • Added validation to detect missing py-files directory
  • Refactored zip() to accept package_type as parameter

Refactoring

• Moved package type detection from zip() function to CLI layer
• Updated cli.py commands to detect and pass package_type
• Removed _get_package_type_for_directory() helper (no longer needed)

Tests

• Added tests for function package type dependency handling
• Added tests for missing py-files error case
• Updated all existing tests to pass package_type parameter
• Removed obsolete test class for removed helper function

Test Plan

• Updated existing tests to pass package_type parameter
• Added tests for function package type dependency handling
• Added tests for missing py-files error case
• All tests passing (66 tests in test_deploy.py)
• Manual testing with sample function projects
• Tested with internal sdk, datacustomcode scan, zip, run, deploy.

Commits

• Function Support for pyfiles
• Complete function pyfiles support with pip install and error handling
• Code refactor

[salesforce-cla]

Thanks for the contribution! It looks like @sarasavilli-sf is an internal user so signing the CLA is not required. However, we need to confirm this.

[joroscoSF]

Testing is a big concern as well.

[ritaagarwala-sf]

I don't see support for libs folder yet

[sarasavilli-sf]

As part of testing

verified datacustomcode commands works

verified scripts run successfully with the new sdk changes