Use Java class file format v52 (JVM 8)
This is required in order to import projects using JVM < 17 (because
our aspects run some Java apps, like PackageParser), as well as IntelliJ
instances hosted on JVMs older than 17.
-build --java_language_version=17
-test --java_language_version=17 --java_runtime_version=17
+build --java_language_version=17 --javacopt=-source --javacopt=8 --javacopt=-target --javacopt=8
+test --java_language_version=17 --javacopt=-source --javacopt=8 --javacopt=-target --javacopt=8 --java_runtime_version=17
