Create intermediate directories in ETCoreMLModelManager (#9562)

ETCoreML crashes in FB app. During debugging, we traced issue down to
this.


cc @kimishpatel @YifanShenSZ @cymbalrush

Author: metascroy

backends/apple/coreml/runtime/delegate/ETCoreMLModelManager.mm

@@ -208,7 +208,7 @@ void set_outputs(std::vector<executorchcoreml::MultiArray>& outputs,
                                     const inmemoryfs::InMemoryFileSystem *inmemory_fs,
                                     NSError * __autoreleasing *error) {
     NSError *local_error = nil;
-    if (![fm createDirectoryAtURL:dst_url withIntermediateDirectories:NO attributes:@{} error:error]) {
+    if (![fm createDirectoryAtURL:dst_url withIntermediateDirectories:YES attributes:@{} error:error]) {
         ETCoreMLLogUnderlyingErrorAndSetNSError(error,
                                                 ETCoreMLErrorModelSaveFailed,
                                                 local_error,