Write TF proto results using size-delimited format

Configure Tradefed to write size-delimited proto result files. This is
required because the BazelTest driver parses these size-delimited
records.

Test: atest bazel-test-runner-tests
Bug: 262916831
Change-Id: I2f8a82f3e6e17af6a728aee915b697b2de72f778
diff --git a/atest/bazel/resources/rules/tradefed_test.sh.template b/atest/bazel/resources/rules/tradefed_test.sh.template
index bf847fe..8b15c93 100644
--- a/atest/bazel/resources/rules/tradefed_test.sh.template
+++ b/atest/bazel/resources/rules/tradefed_test.sh.template
@@ -37,6 +37,7 @@
     --bazel-exit-code-result-reporter:file=${exit_code_file} \
     --bazel-xml-result-reporter:file=${XML_OUTPUT_FILE} \
     --proto-output-file="${TEST_UNDECLARED_OUTPUTS_DIR}/proto-results" \
+    --use-delimited-api=true \
     --log-file-path="${TEST_UNDECLARED_OUTPUTS_DIR}" \
     --compress-files=false \
     "$@"