Fix list of non proxy hosts

[Dohbedoh]

See jenkinsci/azure-vm-agents-plugin#446 and https://learn.microsoft.com/en-us/java/api/com.azure.core.http.proxyoptions?view=azure-java-stable#com-azure-core-http-proxyoptions-setnonproxyhosts(java-lang-string).
List of Non Proxy hosts passed to ProxyOptions.setNonProxyHosts was not | delimited.

Testing done

I do not have an environment to test this at the moment.

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[Dohbedoh]

cc @timja

[timja]

Thanks!