updates actions with source output, fixes bug

[pivotal-david-osullivan]

Summary

Adds source/source-sha outputs to the following actions:

• Github Release - this required grabbing the original TagName from the Release object, since the action overwrites the TagName as it loops through releases.
• Gradle
• IBM Semeru
• Leiningen
• Liberty - this adds sources only if the dependency contains 'openliberty', since the 'websphere' deps are not OSS

Other action updates contain a bug fix when checking the list of sources for empty, it previously checked for nil which won't happen on an empty map, it now checks for length >0

The Skywalking action fixes a bug where an extra / was added to the dependency/binary URI

Use Cases

Checklist

• I have viewed, signed, and submitted the Contributor License Agreement.
• I have linked issue(s) that this PR should close using keywords or the Github UI (See docs)
• I have added an integration test, if necessary.
• I have reviewed the styleguide for guidance on my code quality.
• I'm happy with the commit history on this PR (I have rebased/squashed as needed).