Update Dataflow Debug Capture to use Google API client Jackson 2

DebugCapture is using an old version of the JacksonFactory from Google API client that will not be present when running jobs on Dataflow, but is currently on the test classpath.  Update it to use the latest to match the rest of the Dataflow runner and the Java SDK, and remove the jar providing the old version of the JacksonFactory from the Dataflow runner test configuration.