etcd: Add unit test for release-3.5 branch

[joshjms]

Adding unit test postsubmits and periodics. Continuing #35000.

Ref: #32754

/cc @ivanvc @abdurrehman107

[ivanvc]

Thanks, Joshua. I'm just realizing that we forgot to add arm64 unit tests, too. I was reviewing the code from before we split that architecture into prow jobs, and we used to run arm64 unit tests, but forgot to migrate them.

Could you please enable arm64 in this pull request? Thanks :)

[joshjms]

Ah I see, got it I'll add them

[ivanvc]

/lgtm
/approve

Thanks, @joshjms.

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ivanvc, joshjms

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[k8s-ci-robot]

@joshjms: Updated the job-config configmap in namespace default at cluster test-infra-trusted using the following files:

• key etcd-periodics.yaml using file config/jobs/etcd/etcd-periodics.yaml
• key etcd-postsubmits.yaml using file config/jobs/etcd/etcd-postsubmits.yaml
• key etcd-presubmits.yaml using file config/jobs/etcd/etcd-presubmits.yaml

In response to this:

Adding unit test postsubmits and periodics. Continuing #35000.

Ref: #32754

/cc @ivanvc @abdurrehman107

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