Ci 13616 upload artifacts to j frog

[lkilpatrick-harness]

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Description

https://harness.atlassian.net/browse/CI-13616

Added stage variable examples to https://developer.harness.io/docs/continuous-integration/use-ci/build-and-upload-artifacts/upload-artifacts/upload-artifacts-to-jfrog/

and

https://developer.harness.io/docs/continuous-integration/continuous-integration-faqs/#can-i-run-the-upload-artifacts-to-jfrog-artifactory-step-with-a-non-root-user

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