onnxruntime

Add explicit 'set +x' before printing a vso[] command to avoid output getting parsed again with a trailing quote. (#15986)

Here's the motivating issue:
https://github.com/microsoft/azure-pipelines-tasks/issues/10331

Noticed some problems in other repos so also updating usages in ORT.

We may be fine now without it, but this change adds some safeguard against future additions of 'set -x' for debugging.