Fix Style/NegatedIfElseCondition RuboCop offense

What does this MR do and why?

Fixes:

• Style/NegatedIfElseCondition RuboCop offense: https://docs.rubocop.org/rubocop/cops_style.html#stylenegatedifelsecondition.
• Style/RedundantFreeze RuboCop offense: https://docs.rubocop.org/rubocop/cops_style.html#styleredundantfreeze.

Screenshots, screen recordings, or links to review app

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Blueprint:

• (Before): https://docs.gitlab.com/ee/architecture/blueprints/composable_codebase_using_rails_engines/index.html
• (After): https://eread-fix-negated-if-else-condition-rubocop-offense.docs.gitlab-review.app/ee/architecture/blueprints/composable_codebase_using_rails_engines/index.html

Merge request acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this merge request.