add new debug service core runtime nuspec with portable symbols

[mjkkirschner]

create portable symbols so debugging linux builds of dynamo core requires less manual steps.

• DNM until we see if CER supports this format - if not we'll have to do this conditionally for linux builds.
• support single nuspec file in buildpackages.bat to support @pinzart90's changes in linux build job.
• set commit info on the package using git commit

[pinzart90]

@mjkkirschner maybe another debug nuspec or add a conditional in the current service core nuspec to not filter out pdbs when passing the Configuration as a parameter

[github-actions]

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