Add positive_score_impact to rank_features property

[stevejgordon]

Contributes to #5584

[github-actions]

The backport to master failed:

The process '/usr/bin/git' failed with exit code 1

To backport manually, run these commands in your terminal:

# Fetch latest updates from GitHub
git fetch
# Create a new working tree
git worktree add .worktrees/backport-master master
# Navigate to the new working tree
cd .worktrees/backport-master
# Create a new branch
git switch --create backport-5607-to-master
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick --mainline 1 e2b2eda27bbc13d15a84e6cf9b1ce17085c97429
# Push it to GitHub
git push --set-upstream origin backport-5607-to-master
# Go back to the original working tree
cd ../..
# Delete the working tree
git worktree remove .worktrees/backport-master

Then, create a pull request where the base branch is master and the compare/head branch is backport-5607-to-master.