[3.12] gh-125620: Skip check_resource_tracker_death on NetBSD due to long wait for SIGKILL process termination (GH-125621) (#125673)

gh-125620: Skip check_resource_tracker_death on NetBSD due to long wait for SIGKILL process termination (GH-125621)

* Skip test_resource_tracker_sigkill on NetBSD
(cherry picked from commit a0f5c8e6272a1fd5422892d773923b138e77ae5f)

Co-authored-by: Furkan Onder <furkanonder@protonmail.com>