Fix: Fail to skip disabledmodel in winml (#17728)
### Description
Move appending source name behind the ModifyNameIfDisabledTest
### Motivation and Context
In winml, disabled test name doesn't include the model source name.
WinML job will be broken in the new image.
https://dev.azure.com/onnxruntime/onnxruntime/_build/results?buildId=1151451&view=logs&s=4eef7ad1-5202-529d-b414-e2b14d056c05
### Verified
https://dev.azure.com/onnxruntime/onnxruntime/_build/results?buildId=1151691&view=logs&s=4eef7ad1-5202-529d-b414-e2b14d056c05
