Add bes-id to soong. Also renames the proto field.

This is for integration with BES for bazel test metrics.
Bug: 287102416
Test: b build libcore:all --invocation_id=`uuidgen`
Test: build/bazel/scripts/analyze_build (to verify it's set)

Change-Id: I541b2d65bfa85718fc916582e0540384ae3810d9
diff --git a/ui/build/bazel_metrics.go b/ui/build/bazel_metrics.go
index c0690c1..3f9fbb1 100644
--- a/ui/build/bazel_metrics.go
+++ b/ui/build/bazel_metrics.go
@@ -121,6 +121,7 @@
 			}
 		}
 		bazelMetrics.PhaseTimings = phaseTimings
+		bazelMetrics.BesId = proto.String(config.besId)
 
 		return bazelMetrics
 	}