DYN-3529: Migrate clr.AddReferenceToFileAndPath() to clr.AddReference() in python migration tool

[sm6srw]

Purpose

DYN-3529: Migrate clr.AddReferenceToFileAndPath() to clr.AddReference() in python migration tool

Declarations

Check these if you believe they are true

• The codebase is in a better state after this PR
• Is documented according to the standards
• The level of testing this PR includes is appropriate
• User facing strings, if any, are extracted into *.resx files
• All tests pass using the self-service CI.
• Snapshot of UI changes, if any.
• Changes to the API follow Semantic Versioning and are documented in the API Changes document.
• This PR modifies some build requirements and the readme is updated

[mjkkirschner]

@sm6srw LGTM - though were you able to check if this pythonNet function is a good replacement for the ironPython function? Will it import arbitrary python files from a path?

[sm6srw]

@sm6srw LGTM - though were you able to check if this pythonNet function is a good replacement for the ironPython function? Will it import arbitrary python files from a path?

I am playing around with that now.