Run Unit tests, ITs in parallel if PR is approved. Upgrade checkstyle version #17611
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Instead of running the unit tests first and then running ITs, and other JDK tests, we will rather run all in parallel for faster build time. This is done only when the PR is approved so we are still not wasting gha runner bandwidth.
Also upgraded checkstyle version so it doesn't error out when it sees Java 17 syntax.