set a dependency job to limit qnn jobs to specific paths

[cccclai]

without dependency: https://github.com/pytorch/executorch/actions/runs/18017807043/job/51267174825?pr=14603

with the dependency: eems like the job is skipped https://github.com/pytorch/executorch/actions/runs/18017569385/job/51266354486?pr=14603

with the dependency and trigger with qcom changes: https://github.com/pytorch/executorch/actions/runs/18017856742/job/51267377173?pr=14603

[pytorch-bot]

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[cccclai]

follow up on #14528