#410 Rename externalPluginService to AgentService Pull request opened by pingsutw TL;DR As title Type ☐ Bug Fix ☐ Feature ☐ Plugin Are all requirements met? ☐ Code completed ☐ Smoke tested ☐ Unit tests added ☐ Code documentation added ☐ Any pending items have an associated Issue Complete description ^^^ Tracking Issue ^^^ Follow-up issue NA flyteorg/flyteidl ✅ All checks have passed 13/13 successful checks