Clean up any tag mess when fetching from upstream when you're operating on a downstream fork

gh-prune-upstream-tags.sh

# Clean up the mess of tags that came in from upstream
git push upstream --delete $(git ls-remote --tags upstream | grep "YOUR_TAG_PREFIX_HERE.*[^}]$" | cut -f 2)
# Depending on the use case and tag format, other forms may be more appropriate, e.g.:
git tag --delete $(git ls-remote --tags upstream | cut -f 2 | cut -f 3 -d /)

# Stop git from pulling tags from upstream in the future
git config remote.upstream.tagopt --no-tags