Update .circleci/config.yml to use store_test_results

[CircleCI-config-suggestions-bot]

This pull request suggests a small change to your .circleci/config.yml file to upload test results on CircleCI. No extra cost. Only benefits.

The change unlocks the ability to detect flaky tests and seamlessly visualize test failures in the "Tests tab" in the CircleCI UI, like below.

Questions about how this PR got created? See our community forum.
Happy building!

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.
_{You have signed the CLA already but the status is still pending? Let us recheck it.}