[paddle FE] Fix validation of model path for legacy version #56487

Job	Run time
Smart_CI	27s
Docker	43s
Build / Build	17m 49s
C++ unit tests / C++ unit tests	1m 14s
Debian Packages / Debian Packages	1m 24s
Python unit tests / Python unit tests	5m 17s
ONNX Models Tests	0s
ONNX Runtime Integration	0s
Pytorch Layer Tests / PyTorch Layer Tests	4m 16s
Conformance	0s
Pytorch FX Layer Tests / PyTorch FX Layer Tests	4m 21s
JAX Layer Tests / JAX Layer Tests	2m 47s
Python API tests / Python API tests	0s
OpenVINO JS API	0s
iGPU Tests	0s
NVIDIA plugin	0s
OpenVINO tokenizers extension	0s
GPU_Stub	0s
Samples	0s
dGPU Tests	0s
CPU functional tests	0s
TensorFlow TF Hub Models tests	0s
PyTorch Models tests	0s
TensorFlow Layer Tests	0s
Keras 3 OpenVINO Backend Tests	0s
PyTorch Models Nightly Scope1 tests	0s
TensorFlow Hugging Face Models tests	0s
JAX/Flax Models tests	0s
TensorFlow Models tests	0s
PyTorch Models Nightly Scope2 tests	0s
ci/gha_overall_status	2s
	38m 20s

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