test(enable): update import-offer integration tests for non-interactive behavior

The offer no longer auto-imports in a non-interactive enable without --yes. Update the integration tests accordingly:

• FirstRunAutoImports now passes --yes to exercise auto-import.
• Add NonInteractiveWithoutYesHints: a no-TTY enable without --yes must not import and must point at entire import.
• NotOfferedOnReEnable passes --yes so the first enable imports.