onnxruntime

[TensorRT EP] Fix mem leak for TRT plugins custom ops (#19248)

TRT EP's GetTensorRTCustomOpDomainList() will create vector of
OrtCustomOpDomain objects and release the ownership of those objects.
But, thoses objects are not released forever.
In session level, we need to make TRT EP remember what OrtCustomOpDomain
objects it created and release them at EP destruction time.