Fix non-auto-correctable Naming/HeredocDelimiterNaming offenses

Jonston Chanrequested to merge
gitlab-community/gitlab-org/gitlab:589138-Naming/HeredocDelimiterNaming-kuadc into master

What does this MR do and why?

This MR fixes non-auto-correctable Naming/HeredocDelimiterNaming offenses. These changes make the tests more readable and easier to understand.

References

#589138

Screenshots or screen recordings

Not applicable. There are no behavioural changes introduced in this MR and the delimiter is just a label.

How to set up and validate locally

  1. run bundle exec rubocop
  2. verify no issues reported

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