trunk/43b3e72193745ae3c6c5394f05bbe6a79b43f641: [CI] Restrict the LF fleet to the allowlisted runner types (#200862)

发生了什么

Impact: CI only Risk: low What Flips lf_allowlist.mode in .github/arc.yaml from all to restricted . With that, only the runner types in the allowlist can keep the lf- prefix. Any other test-matrix job that would have gone to LF gets rewritten to mt- and runs on the Meta clusters. Why Part of pytorch/ci-infra#1081 . The wiring that enforces the allowlist is already on main. This is the switch that turns it on, so day…

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