[examples][fidl] heartbeat: Remove deprecated_bare_package_url

CF-531 #done
CF-532 #done

Test: run
fuchsia-pkg://fuchsia.com/heartbeat_client_go#meta/heartbeat_client_go.cmx

Change-Id: I2e63fc8dcfcfa8740c9d5c9562a9d3bf33239726
4 files changed