[3.5] Remove defunct release-3.5 arm64 github actions workflows

[jmhbnz]

These jobs have now been migrated to prow in:

• https://github.com/kubernetes/test-infra/pull/33733
• https://github.com/kubernetes/test-infra/pull/33734

[k8s-ci-robot]

Skipping CI for Draft Pull Request. If you want CI signal for your change, please convert it to an actual PR. You can still manually trigger a test run with /test all

[jmhbnz]

/test all

[jmhbnz]

/test pull-etcd-integration-1-cpu-arm64 /test pull-etcd-integration-2-cpu-arm64 /test pull-etcd-integration-4-cpu-arm64

[ivanvc]

@jmhbnz, just a heads up that I'm also testing the prow jobs in this PR: #18784

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ahrtr, ivanvc, jmhbnz

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Needs approval from an approver in each of these files: - ~~[OWNERS](https://github.com/etcd-io/etcd/blob/release-3.5/OWNERS)~~ [ahrtr,jmhbnz] Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment

[ivanvc]

/retitle [3.5] Remove defunct release-3.5 arm64 github actions workflows