.bazelrc: set --test_output=errors to debug master build failures

Backported from D429,

GitOrigin-RevId: 05a024e59fd598e180249c55a21dc1f8eaa24dc4
diff --git a/.bazelrc b/.bazelrc
index e1effb3..760889c 100644
--- a/.bazelrc
+++ b/.bazelrc
@@ -1,3 +1,3 @@
 startup --batch_cpu_scheduling --io_nice_level 7
 build --jobs 12 --ram_utilization_factor 50
-test --jobs 12
+test --jobs 12 --test_output=errors