[paulbalandan]

Description
Next batch of the command migration. help, list, key:generate and key:rotate now write through $this->getOutput(), and the confirmations of the two key commands ask through $this->getPrompt(), so a Prompt override reaches them.

• list wraps its descriptions with Output::wrap().
• The private methods that write take the output from their caller.
• key:generate no longer prints a blank line after its success message.

There are no other output changes, and the existing tests pass unchanged.

Checklist:

• Securely signed commits
• Component(s) with PHPDoc blocks, only if necessary or adds value (without duplication)
• Unit testing, with >80% coverage
• User guide updated
• Conforms to style guide