Turn off auto garbage collection to help with big patches

[markapruett]

Issue #, if available:

Description of changes:
We recently added a big patch that vendored deps, which caused the clean up command to fail because the .git file was still in use likely due to a race between the git gc and clean up of some huge patch files.

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[markapruett]

/approve

[eks-distro-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: markapruett

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[eks-distro-bot]

@markapruett: Updated the job-config configmap in namespace default at cluster default using the following files:

• key eks-distro-attribution-periodics.yaml using file jobs/aws/eks-distro/eks-distro-attribution-periodics.yaml

In response to this:

Issue #, if available:

Description of changes:
We recently added a big patch that vendored deps, which caused the clean up command to fail because the .git file was still in use likely due to a race between the git gc and clean up of some huge patch files.

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.