Follow-up from "Improve merge train help text [RUN-AS-IF-FOSS]"

The following discussion from !71687 (merged) should be addressed:

• @mrincon started a discussion:

  Suggestion: We could avoid prop drilling by generating this help link directly in the component using helpPagePath. This is the original definition:

     def merge_train_when_pipeline_succeeds_docs_path
        help_page_path('ci/pipelines/merge_trains.md', anchor: 'add-a-merge-request-to-a-merge-train')
      end

  This may need some cleanup that could be out of the scope so we could also address this as a follow up:

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