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

[st0012]

Motivation / Background

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

Discussion: #50796 (comment)

Detail

Additional information

Checklist

Before submitting the PR make sure the following are checked:

• This Pull Request is related to one change. Changes that are unrelated should be opened in separate PRs.
• Commit message has a detailed description of what changed and why. If this PR fixes a related issue include it in the commit message. Ex: [Fix #issue-number]
• Tests are added or updated if you fix a bug or add a feature.
• CHANGELOG files are updated for the changed libraries if there is a behavior change or additional feature. Minor bug fixes and documentation changes should not be included.

[byroot]

Interestingly one related test failed, but only on the 3.2 suite. I wonder if it's maybe an ordering issue?

Error:
Rails::ConsoleTest#test_prompt_env_colorization:
NameError: uninitialized constant Rails::ConsoleMethods
    test/commands/console_test.rb:62:in `new'
    test/commands/console_test.rb:62:in `test_prompt_env_colorization'
 
bin/rails test test/commands/console_test.rb:61

[st0012]

Yeah it's because that test case's setup was incomplete. I added a separate commit for the fix as it should be done regardless if we're changing the color or not.