conform test to formatter

src/ruby/end2end/channel_closing_driver.rb

src/ruby/end2end/channel_state_driver.rb

src/ruby/end2end/end2end_common.rb

src/ruby/end2end/killed_client_thread_client.rb

src/ruby/end2end/killed_client_thread_driver.rb

src/ruby/end2end/sig_handling_driver.rb

src/ruby/end2end/sig_int_during_channel_watch_driver.rb

tools/run_tests/helper_scripts/run_ruby_end2end_tests.sh