Fix Gitlab/JsonSafeParse: lib/gitlab/import_export/json/ndjson_reader.rb

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Fix Gitlab/JsonSafeParse violations in this file by replacing Gitlab::Json.parse with Gitlab::Json.safe_parse.

Related MR: !215073 (merged)

Implementation Plan

A contributor needs to replace Gitlab::Json.parse with Gitlab::Json.safe_parse in this file.