m/test/e2e: use concise-style logging

Making our test logs look like LogEntry.ConciseString() means we have
significantly more readable test logs.

Change-Id: I0b1eab6a5a837bb2001f3b32779c23df2feaa381
Reviewed-on: https://review.monogon.dev/c/monogon/+/1362
Reviewed-by: Leopold Schabel <leo@monogon.tech>
Tested-by: Jenkins CI
diff --git a/metropolis/test/launch/BUILD.bazel b/metropolis/test/launch/BUILD.bazel
index ff476c6..91c3b3d 100644
--- a/metropolis/test/launch/BUILD.bazel
+++ b/metropolis/test/launch/BUILD.bazel
@@ -2,7 +2,10 @@
 
 go_library(
     name = "launch",
-    srcs = ["launch.go"],
+    srcs = [
+        "launch.go",
+        "log.go",
+    ],
     importpath = "source.monogon.dev/metropolis/test/launch",
     visibility = ["//metropolis:__subpackages__"],
     deps = [