Right now when we add/remove platforms, we have to edit this file manually. But the list of platforms and the repos we release to for each platform (org and/or enterprise) are already part of the release code in the platform package.

We've seen at least one bug in the release process from an incorrect change to the repo-config.yml file, TOOLS-3155.

We should be able to instead generate this file based on the list of platforms in the release code.

Acceptance Criteria

• Change the release code to generate this file and remove the file from the repo.
• Add some tests to ensure that what we generate matches the existing file.