Codecove has released beta version of Test Analytics feature
more details can be found [here|https://docs.codecov.com/docs/test-result-ingestion-beta]

Since we are already integrated with Codecov (storing code coverage data) the idea is to try out if Test Analytics feature will provide visibility over flaky tests and stability of the tests/build. Hopefully, we will have a base to compare and identify regressions.

Changes (only in build actions)
    - Add step to publish junit report files to codecove
    - Add basic codecov.yml config (filter out files that are not junit reports)

Conditionally upload junit reports only on nightly build & push to branch