ciflow/inductor-pallas/198695: Use OSDC runner labels directly in the workflows

发生了什么

CI has been on OSDC for months, but the workflows still name EC2 runners and _linux-build.yml translates them at runtime through arc.yaml. The indirection buys nothing now and hides which pod a job actually lands on. Every prefixed label is rewritten to the pod it already resolved to, so the runner a job gets is unchanged. The determinator still supplies the mt-/lf- prefix, so fleet routing is untouched. Runners wit…

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