[TRT/TRT RTX EP] Fix bug for missing outputs in the returning ComputeCapability/IndexedSubGraph

[chilo-ms]

Description

For TRT EP's GetCapability(), in some case, the GetSubGraph() won't add graph's output to the ComputeCapability/IndexedSubGraph returning to ORT.

The issue if from following code:

...
if (node->GetOutputEdgesCount() > node->OutputDefs().size()) {
 ... // execute here
} else {
  ...
          if (graph_output_names.find(output->Name()) != graph_output_names.end()) {
            graph_outputs_to_add[output] = output_order; // missing this
          }
}

Update TRT RTX EP as well.

Motivation and Context

#25373

[github-actions]

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