Revert "Make GHA workflow to retrieve latest promote-able SHA from master (#79548)"
This reverts commit e479daed78b80179466c7233203c98a3fc0fc117.
Reverted https://github.com/pytorch/pytorch/pull/79548 on behalf of https://github.com/malfet due to Broke on trunk, see https://hud.pytorch.org/pytorch/pytorch/commit/e479daed78b80179466c7233203c98a3fc0fc117
