chore: use self hosted ephemeral runner (#11253)

* chore: use self hosted ephemeral runner

In November and periodically since we have ran into issue with runners hanging and not properly cleaning themselves up causing our CI/CD pipeline to fail due to timeout or self canceling.

* chore: add actionlint for selfhosted runners

* fix: skip nightly test when skip flags are set

* fix: json string format

* chore: change to use run_on string directly

${{ inputs['runs_on'] || github.event.inputs['runs_on'] || 'ubuntu-latest' }}

* chore: use self hosted ephemeral runner

* chore: use self hosted ephemeral runner

* chore: use self hosted ephemeral runner

* chore: revert ephemeral runner testing changes, restore main-only guards

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Co-authored-by: vijay kumar katuri <[email protected]>