ci/request-reviews: use generic wording instead of "code owner"

# And we don't want to rerequest reviews from people who already reviewed

while read -r user; do

    if [[ -v users[${user,,}] ]]; then

        log "User $user is a code owner but has already left a review, ignoring"

        log "User $user is a potential reviewer, but has already left a review, ignoring"

        unset 'users[${user,,}]'

    fi

done < "$tmp/already-reviewed-by"