Fix an issue where the CI job attempts to install the wrong executable
when on macOS/aarch64.
Also, adjusts native test definitions in pkl-server to match pkl-core.
* Don't expose JDK internal classes; instead solve msgpack issue with `--initialize-at-run-time`.
* Use quick build mode for non-release builds: 40% faster compilation, 20% smaller executable.
* Remove options that were commented out.
* Also run ServerTest against native executable
This change activates the `TYPESAFE_PROJECT_ACCESSORS` feature
preview in Gradle, and switches to such accessors instead of
string-based project references, where possible
Relates-To: apple/pkl#204
Signed-off-by: Sam Gammon <sam@elide.ventures>
