fix: reduce test cases and memory for image benchmark

[ComradeProgrammer]

When trying to run this benchmark in minikube's github action, some problems occurred. See GoogleContainerTools/minikube-image-benchmark#40

To solve this problem, a PR has been created for minikube-image-benchmark adding some feature to solve the problems.
and, according to the changes introduced by that PR, some small changes also need to be added to minikube's github action, so that we can use the new features

The Before-After comparasion:

After: https://github.com/ComradeProgrammer/minikube/actions/runs/6495925502/job/17641822215
This is a test run on github action. This time image-benchmark can be executed correctly on github action instance.
(The status of this action is still error, it is because of the aws s3 command, from the log you can see the image-benchmark execution was successful)

[k8s-ci-robot]

Hi @ComradeProgrammer. Thanks for your PR.

I'm waiting for a kubernetes member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

I understand the commands that are listed here.

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.

[minikube-bot]

Can one of the admins verify this patch?

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ComradeProgrammer, medyagh

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• OWNERS [medyagh]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment