Investigate & remove sensitive information from logs

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See https://gitlab.com/gitlab-org/manage/import/backend/discussion/-/issues/9 for context

Sensitive information should not be included in logs or error messages.

Proposal

• Define (or find definitions of) sensitive information relevant to import / export
  • E.g. tokens, API keys
• Identify how & where logging occurs during the import / export processes
• Identify how & where errors are presented to users during the import / export processes
• Review the above code to ensure sensitive information is not disclosed
• (If warranted and feasible) create rubocop rules to prevent info disclosure in the future