Merge pull request #8916 from apolcyn/turn_on_thread_fails_on_ruby_unit_tests

turn on Thread.abort_on_exception in ruby unit tests by default

src/ruby/spec/spec_helper.rb

@@ -67,3 +67,5 @@ RSpec.configure do |config|
 end
 
 RSpec::Expectations.configuration.warn_about_potential_false_positives = false
+
+Thread.abort_on_exception = true