Add support for matching full Atlassian JIRA URLs in the format
https://scylladb.atlassian.net/browse/SCYLLADB-400 in addition to
the bare JIRA key format (SCYLLADB-400).
This makes the validation more flexible by accepting both formats
that developers commonly use when referencing JIRA issues.
Fixes: https://github.com/scylladb/scylladb/issues/28373
Closes scylladb/scylladb#28374
(cherry picked from commit 3f10f44232)
Closes scylladb/scylladb#28394