Remove deprecated chromedriver-helper from dev_tests generator

chromedriver-helper was deprecated in March 2019 and is incompatible
with modern selenium-webdriver (4.x). The gem tries to set
Selenium::WebDriver::Chrome.driver_path which no longer exists.

Modern selenium-webdriver uses webdriver-manager internally for driver
management. GitHub Actions and most CI environments have Chrome and
ChromeDriver pre-installed, so no driver helper gem is needed.

This fixes the minimum version example tests which were failing with:
"undefined method `driver_path=' for Selenium::WebDriver::Chrome:Module"

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: justin808

react_on_rails/lib/generators/react_on_rails/dev_tests_generator.rb

@@ -31,7 +31,8 @@ def copy_tests
 
       def add_test_related_gems_to_gemfile
         gem("rspec-rails", group: :test)
-        gem("chromedriver-helper", group: :test)
+        # NOTE: chromedriver-helper was deprecated in 2019. Modern selenium-webdriver (4.x)
+        # and GitHub Actions have built-in driver management, so no driver helper is needed.
         gem("coveralls", require: false)
       end
 

react_on_rails/spec/react_on_rails/generators/dev_tests_generator_spec.rb

@@ -34,7 +34,8 @@
       assert_file("Gemfile") do |contents|
         expect(contents).to match("gem \"rspec-rails\", group: :test")
         expect(contents).to match("gem \"coveralls\", require: false")
-        expect(contents).to match("gem \"chromedriver-helper\", group: :test")
+        # chromedriver-helper was removed as it's deprecated since 2019
+        # Modern selenium-webdriver (4.x) handles driver management automatically
       end
     end
   end