ci: remove Tests workflow

[vitorfloriano]

This workflow has been migrated to Prow as the pull-node-readiness-controller-test presubmit job.

Follow-up to kubernetes/test-infra#37035

[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

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: vitorfloriano
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[Priyankasaggu11929]

LGTM (and thank you for creating the follow up PR).

keeping a hold until PR kubernetes/test-infra#37035 is merged first, and we have atleast one green test showing up in prow/testgrid.

/hold