Add rubocop to ensure disabling comment aligns with expected format

Description of the proposal

Add rubocop to ensure disabling comment aligns with expected format

• move the check to the left a bit and allow developer to detect the issue quicker before danger.

      # @example RequireColon: true (default)
      #   # bad
      #   # rubocop:disable Some/Cop, Another/Cop
      #
      #   # good
      #   # rubocop:disable Some/Cop, Another/Cop -- Some reason

Refs

• https://docs.gitlab.com/ee/development/rubocop_development_guide.html#disabling-rules-inline
• Add rubocop cop to lint format of the rubocop i... (#428762 - closed)
• Feedback: rubocop inline disable suggesting (#428157)

Check-list

• Make sure this MR enables a static analysis check rule for new usage but ignores current offenses.
• Mention this proposal in the relevant Slack channels (e.g. #development, #backend, #frontend).
• The MR doesn't have significant objections, and is getting a majority of 👍 vs 👎 (remember that we don't need to reach a consensus).
• (If applicable) One style is getting a majority of vote (compared to the other choice).
• (If applicable) Update the MR with the chosen style.
• Create a follow-up issue to fix the current offenses as a separate iteration: ISSUE_LINK
• Follow the review process as usual.
• Once approved and merged by a maintainer, mention it again:
  • In the relevant Slack channels (e.g. #development, #backend, #frontend).
  • (Optional depending on the impact of the change) In the Engineering Week in Review.