Refactor remove approvers if not used

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The ee/app/models/concerns/approval_rule_like.rb file contains an approvers method that does not appear to be called anymore so it should be removed

The following discussion from !134108 (merged) should be addressed:

• @terrichu started a discussion: (+1 comment)

  question (non-blocking): Can this method now be removed? I don't know this area of code well. Perhaps better to be explored in a follow up