d859067486
This PR contains few fixes and improvment seen during https://github.com/scylladb/scylladb/issues/15902 label addtion When we add a label to an issue, we go through all PR. 1) Setting PR base to `master` (release PR are not relevant) 2) Since for each Issue we have only one PR, ending the search after a match was found 3) Make sure to skip PR with empty body (mainly debug one) 4) Set backport label prefix to `backport/` Closes scylladb/scylladb#17912