Replace escaped newlines in existing repo_map.json files

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Current Behavior

For #199 (closed) we're updating the Public_Key field for new repo_map entries so that it doesn't contain escaped newlines (\\n).

Purpose

This ticket is being created to track progress for updating all of the existing repo_maps and their entries to no longer contain escaped newlines for the Public_Key field.

Plan

• Create project to update all repo_maps in S3
• Use boto3 to run a one time job for updating all of the repo_maps in s3
• Test on pipeline-test-projects
• Run on all of Ironbank Containers in S3

Acceptance Criteria

• All repo_maps are updated correctly