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repo-updater: Add AWSCodeCommitSetBogusGitCredentialsMigration

Administrator requested to merge core/aws-cc-bogus-credentials-migration into master

Created by: mrnugget

PR #3878 introduced a new, required setting for AWS CodeCommit external services: gitCredentials. Without setting this, the config is invalid and the repo-updater wouldn't boot up, because it failed in the EnabledStateDeprecationMigration and retried it indefinitely.

That makes the upgrade for users needlessly hard:

  • a user cannot add the gitCredentials setting to the config before upgrading, because that would make the config invalid
  • after upgrading the user can add gitCredentials to the AWS CodeCommit but syncing the new config to repo-updater would fail since it's busy retrying the EnabledStateDeprecationMigration
  • the user would have to manually restart repo-updater to pick up the updated and valid config

This commit remedies that problem but introducing a migration that runs automatically when repo-updater boots up. This migration makes the config "valid" by adding bogus gitCredentials that allow repo-updater the and the rest of the system to boot up but also signal to the user that they need to be changed.

Test plan: go test

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