Use java language level to Java 11 for running tests

Following the Change-Id: I79434c657 use the same Java 11
tool_chain for running tests as well.

With this change, it isn't required to have any local Java 11
setups for being able to build and run tests using Bazel.

Running Gerrit E2E tests would still require to have a local
Java 11 JDK setup.

Change-Id: I46fdbc2032084538be676a81b26bcd0f1d436a6b
diff --git a/.bazelrc b/.bazelrc
index 9f13f70..b9189c1 100644
--- a/.bazelrc
+++ b/.bazelrc
@@ -13,5 +13,6 @@
 
 test --build_tests_only
 test --test_output=errors
+test --java_toolchain=//tools:error_prone_warnings_toolchain_java11
 
 import %workspace%/tools/remote-bazelrc