Description of the changes:
Update the .gitignore to ignore GraphingImplOverrides.props.
This update already exists in the feature branch but we can merge it to master now to make development of the feature easier and prevent accidentally commiting this file.
How changes were validated:
Manual.
Switch to feature branch. Add GraphingImplOverrides.props
Switch to dabelc/IgnoreGraphingImplOverrides.props. Confirm git shows no files changed but props file is present.
