Expand bundle gem to allow users to choose between Code of Conducts.

[colby-swandale]

What was the end-user or developer problem that led to this PR?

The bundle gem command has been using the Contributor Covenant since 2014, but it was recently updated to the Ruby CoC when the RubyGems project was moved under the Ruby Organization.

I want to improve the project by updating the bundle gem command to offer a choice between the two going forward. This will also allow the Ruby community to nominate any future Code of Conducts more easily if needed.

What is your fix for the problem, implemented in this PR?

This Pull Request updates the bundle gem --coc option to allow users to select between the Ruby CoC or the Contributor Covenant. It takes into account any previous configuration (before: Boolean, after: String) for this option and handles the migration to the new functionality appropriately.

Make sure the following tasks are checked

• Describe the problem / feature
• Write tests for features and bug fixes
• Write code to solve the problem
• Make sure you follow the current code style and write meaningful commit messages without tags

[Copilot]

Pull request overview

This PR expands the bundle gem command to allow users to choose between different Code of Conducts (Contributor Covenant or Ruby Community Conduct Guideline) instead of a boolean on/off option. The change migrates the configuration from a boolean to a string value while maintaining backward compatibility with existing boolean configurations.

Changes:

• Updated --coc option to accept string values: contributor-covenant, ruby, or none
• Added two new Code of Conduct templates for the different options
• Implemented backward compatibility logic to migrate legacy boolean values (true/false) to the new string-based system
• Updated tests to cover all new functionality and edge cases

Reviewed changes

Copilot reviewed 6 out of 7 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
bundler/spec/commands/newgem_spec.rb	Comprehensive test coverage for new CoC options, backward compatibility, and configuration behavior
bundler/lib/bundler/templates/newgem/RUBY_SRC_CODE_OF_CONDUCT.md.tt	New template for Ruby Community Conduct Guideline
bundler/lib/bundler/templates/newgem/CONTRIBUTOR_COVENANT_CODE_OF_CONDUCT.md.tt	New template for Contributor Covenant v3.0
bundler/lib/bundler/settings.rb	Moved gem.coc from BOOL_KEYS to STRING_KEYS to support string values
bundler/lib/bundler/man/bundle-gem.1.ronn	Updated documentation for the new --coc options
bundler/lib/bundler/cli/gem.rb	Implemented ask_and_set_coc method with backward compatibility logic
bundler/lib/bundler/cli.rb	Updated method_option for --coc to accept string enum with lazy_default

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