Refactor compare index to use helper for data attributes

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The following discussion from !52967 (merged) should be addressed:

• @jivanvl started a discussion:

  Suggestion (optional) There's fair amount of data attributes for this app, I think it would be beneficial to move them to a helper a function and call that function here, an example of this pattern can be found at

  https://gitlab.com/gitlab-org/gitlab/-/blob/master/ee/app/helpers/ee/operations_helper.rb#L16

  https://gitlab.com/gitlab-org/gitlab/-/blob/master/app/views/projects/environments/folder.html.haml