[RPD-236] Improved approach to check ignored folder when uploading and downloading

[swells2020]

Prior to this PR, there were two different methods for traversing through a file structure and modifying files in that structure based on certain criteria. This PR seeks to simplify things by applying a single, consistent method. This PR updates the _sync_local and upload_folder functions in the AzureStorage class to use consistent methods for iterating over the local or remote .matcha file structure.

Checklist

Please ensure you have done the following:

• [X] I have read the CONTRIBUTING guide.
• [ ] I have updated the documentation if required.
• [X] I have added tests which cover my changes.

Type of change

Tick all those that apply:

• [ ] Bug Fix (non-breaking change, fixing an issue)
• [ ] New feature (non-breaking change to add functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)
• [X] Other (add details above)