[BEAM-2566] Remove References to CloudObject from the Java Harness

[tgroh]

Follow this checklist to help us incorporate your contribution quickly and easily:

• Make sure there is a JIRA issue filed for the change (usually before you start working on it). Trivial changes like typos do not require a JIRA issue. Your pull request should address just this issue, without pulling in other changes.
• Each commit in the pull request should have a meaningful subject line and body.
• Format the pull request title like [BEAM-XXX] Fixes bug in ApproximateQuantiles, where you replace BEAM-XXX with the appropriate JIRA issue.
• Write a pull request description that is detailed enough to understand what the pull request does, how, and why.
• Run mvn clean verify to make sure basic checks pass. A more thorough check will be performed on your pull request automatically.
• If this contribution is large, please file an Apache Individual Contributor License Agreement.

---

Migrates to using the shared Runner API definitions.

[coveralls]

Coverage increased (+0.01%) to 70.484% when pulling ba57d78 on tgroh:rm_cloud_object into 892a2cf on apache:master.

[tgroh]

R: @vikkyrk
CC: @kennknowles @lukecwik

[coveralls]

Coverage increased (+0.01%) to 70.481% when pulling 5f5cf7d on tgroh:rm_cloud_object into 892a2cf on apache:master.

[vikkyrk]

LGTM