etcd: import release tests presubmit job

[ivanvc]

Name the job "pull-etcd-release-tests" to emphasize that it runs tests from the release scripts and does not do automated releases.

Part of #32754.

/cc @jmhbnz

[jmhbnz]

/lgtm
/approve

Thanks @ivanvc

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[k8s-ci-robot]

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

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

In response to this:

Name the job "pull-etcd-release-tests" to emphasize that it runs tests from the release scripts and does not do automated releases.

Part of #32754.

/cc @jmhbnz

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