Danger: Suggest to use formalized reason for inline disables of cops

What does this MR do and why?

Let Danger bot ⚡ 🤖 suggest to recommended way of add a code comment when disabling a RuboCop rule inline.

See https://docs.gitlab.com/ee/development/rubocop_development_guide.html#disabling-rules-inline

Inspired by !134882 (comment 1615016584)

Related to #429264 (closed)

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