Remove Rails.logger calls in lib/api/*

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The following discussion from !19591 (merged) should be addressed:

• @ashmckenzie started a discussion:

  I like the idea of logging (👍) but we should be using structured logging as documented at https://docs.gitlab.com/ee/development/logging.html 🙂

  Let's handle this in a follow-up Issue because there's one other Rails.logger call in lib/api/helpers/internal_helpers.rb