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ci: Use all 4 cores during build test for server (#7077)

* Use all 4 cores during build test for server

Ref: https://docs.github.com/en/actions/using-github-hosted-runners/using-github-hosted-runners/about-github-hosted-runners#standard-github-hosted-runners-for-public-repositories

GitHub Runners for Ubuntu have 4 cores.
Maven 3+ has experimental support for parallel builds https://cwiki.apache.org/confluence/display/MAVEN/Parallel+builds+in+Maven+3
I've tested locally on my Windows 11 PC with `mvn -T 8 clean package` and saw no issues, but instead a vastly faster build about 1/4 the time, since we already did a pretty good job of our multi-module project and declaring all the dependencies correctly, it's able to figure out what can run in parallel over the CPU cores I have (8 cores).

The other alternative is to use Maven Daemon (built with GraalVM and fast like Gradle) https://github.com/apache/maven-mvnd
But that's much more involved and requires building and setting up a customer Runner image that has Maven Daemon installed; and then we'd need to keep it up to date; more maintenance we don't need to take on.

* add pull_request_server.yml to on pull request paths

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