increase ephemeral storage for k8s 1.29-1.31 test presubmits

[vineeth-bandi]

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[vineeth-bandi]

/approve

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[adityavenneti]

/lgtm

[eks-distro-bot]

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

• key kubernetes-1-29-test-presubmits.yaml using file jobs/aws/eks-distro/kubernetes-1-29-test-presubmits.yaml
• key kubernetes-1-30-test-presubmits.yaml using file jobs/aws/eks-distro/kubernetes-1-30-test-presubmits.yaml
• key kubernetes-1-31-test-presubmits.yaml using file jobs/aws/eks-distro/kubernetes-1-31-test-presubmits.yaml

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