Use `std::string_view` directly as key to `absl::flat_hash_map::find`#26682

cbourjau wants to merge 1 commit intomicrosoft:mainmicrosoft/onnxruntime:mainfrom

cbourjau:use-string_view-as-keycbourjau/onnxruntime:use-string_view-as-keyCopy head branch name to clipboard