onnxruntime

ec9b8fef - Fix early check that prevents a compiled model from being overwritten (#26439)

Fix early check that prevents a compiled model from being overwritten (#26439) ### Description Fixes https://github.com/microsoft/onnxruntime/issues/26294 When using the old model compilation approach (session option configuration), ORT should verify that the generated output model does not already exist. Importantly, this check should be done _before_ calling an EP's compile() method. This PR fixes this check, which was unintentionally disabled by a [previous PR.](https://github.com/microsoft/onnxruntime/pull/25455). Note that this check also (correctly) happens _after_ calling the EP's compile() method, but it is better to catch it early if we can. ### Motivation and Context Fixes a regression in the older compilation workflow.