Add whatif and export support NpmDsc

[Gijsreyn]

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Addresses export and whatif support for NpmDsc.

Microsoft Reviewers: Open in CodeFlow

[Gijsreyn]

Hey @ryfu-msft. I liked to work on NPM and wanted to expand a bit on it. I've made some updates that I believe will enhance its functionality. Could you please review my pull request and share your feedback? Thanks!

[ryfu-msft]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[Gijsreyn]

Thanks for the run Ryan, can you please run it once again? I added some debug line to see if there is actual result. It's pretty strange, because when I ran it locally, it succeeded.

[ryfu-msft]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[Gijsreyn]

I couldn't really make sense why it was not working, until I started running it under my own Azure Pipelines agents. After tremendous debugging, I rewrote the logic to determine the paths to look for. To reduce the calling to npm, I have included one hardcoded path. If that is not found, it will attempt to use the npm cache list to find it. Now I can see the following:

Can you give it another go @ryfu-msft ? Thanks in advance!