Display dev/test env in console prompt in blue instead of green

The combination of red and blue is more color-blind friendly than red
and green.

Discussion: rails#50796 (comment)

railties/CHANGELOG.md

@@ -11,7 +11,7 @@
     For example, `MyApp` will displayed as `my-app` in the prompt.
 
     Additionally, the environment name will be colorized when the environment is
-    `development` (green), `test` (green), or `production` (red), if your
+    `development` (blue), `test` (blue), or `production` (red), if your
     terminal supports it.
 
     *Stan Lo*

railties/lib/rails/commands/console/console_command.rb

@@ -53,9 +53,9 @@ def start
       def colorized_env
         case Rails.env
         when "development"
-          IRB::Color.colorize("dev", [:GREEN])
+          IRB::Color.colorize("dev", [:BLUE])
         when "test"
-          IRB::Color.colorize("test", [:GREEN])
+          IRB::Color.colorize("test", [:BLUE])
         when "production"
           IRB::Color.colorize("prod", [:RED])
         else

railties/test/commands/console_test.rb

@@ -61,14 +61,14 @@ def test_console_defaults_to_IRB
   def test_prompt_env_colorization
     irb_console = Rails::Console::IRBConsole.new(app)
     red = "\e[31m"
-    green = "\e[32m"
+    blue = "\e[34m"
     clear = "\e[0m"
 
     Rails.env = "development"
-    assert_equal("#{green}dev#{clear}", irb_console.colorized_env)
+    assert_equal("#{blue}dev#{clear}", irb_console.colorized_env)
 
     Rails.env = "test"
-    assert_equal("#{green}test#{clear}", irb_console.colorized_env)
+    assert_equal("#{blue}test#{clear}", irb_console.colorized_env)
 
     Rails.env = "production"
     assert_equal("#{red}prod#{clear}", irb_console.colorized_env)