DEV: Use runtime info to split test files for parallel testing (#22060)

Using the runtime information, we will be able to more efficiently group
the test files across the test processes hence leading to better
utilization of resources.

bin/turbo_rspec

@@ -13,6 +13,7 @@ fail_fast = nil
 seed = rand(2**16)
 profile = false
 profile_print_slowest_examples_count = 10
+use_runtime_info = nil
 
 OptionParser
   .new do |opts|
@@ -49,6 +50,10 @@ OptionParser
     end
 
     opts.on("--seed SEED", "The seed for the random order") { |s| seed = s.to_i }
+
+    opts.on("--use-runtime-info", "Use runtime info for tests group splitting") do
+      use_runtime_info = true
+    end
   end
   .parse!(ARGV)
 
@@ -60,10 +65,10 @@ formatters.each { |formatter| formatter[:outputs] << "-" if formatter[:outputs].
 
 if ARGV.empty?
   files = TurboTests::Runner.default_spec_folders
-  use_runtime_info = true
+  use_runtime_info = true if use_runtime_info.nil?
 else
   files = ARGV
-  use_runtime_info = false
+  use_runtime_info = false if use_runtime_info.nil?
 end
 
 puts "::group::Run turbo_rspec" if ENV["GITHUB_ACTIONS"]