DEV: Use binding.pry instead of byebug for system pause_test (#19420)

binding.pry gives a nicer syntax-highlighted environment
and better formatting for inspecting objects, and we still
have the byebug continue/step/next commands (which you can
also alias via .pryrc) via the pry-byebug gem

spec/support/system_helpers.rb

@@ -7,7 +7,7 @@ module SystemHelpers
       ask(
         "\n\e[33mTest paused, press enter to resume, type `d` and press enter to start debugger.\e[0m",
       )
-    byebug if result == "d" # rubocop:disable Lint/Debugger
+    binding.pry if result == "d" # rubocop:disable Lint/Debugger
     self
   end