Make our presubmits run non-small tests.

Unfortunately, //bazel:generate_cargo_files_test does not run because it's not marked as small, and there's no way to mark it as small.
This should be fixed by bazel-contrib/bazel-lib#839

BUG=None
TEST=portage/tools/run_tests.sh

Change-Id: Iea7b85df7d59b6f0bfaa6973a4e41119d9d6c102
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/bazel/+/5531394
Auto-Submit: Matt Stark <msta@google.com>
Reviewed-by: Shuhei Takahashi <nya@chromium.org>
Commit-Queue: Shuhei Takahashi <nya@chromium.org>
Tested-by: Matt Stark <msta@google.com>

portage/tools/run_tests.sh

@@ -27,9 +27,11 @@ fi
 
 set -x
 
-  # Despite the name, bazel test also builds non-test targets if they're listed.
+# Despite the name, bazel test also builds non-test targets if they're listed.
+# TODO: Once github.com/bazelbuild/bazel/issues/22355 is resolved, remove
+#  medium from the test size filters.
 exec bazel test \
-    --test_size_filters=small \
+    --test_size_filters=small,medium \
     --config=format \
     --keep_going \
     "$@" \