Run unit tests in parallel.

build.gradle.kts

@@ -66,6 +66,10 @@ subprojects {
       dependsOn("clean", "testReleaseUnitTest", "lintRelease")
     }
   }
+
+  tasks.withType<Test>().configureEach {
+    maxParallelForks = (Runtime.getRuntime().availableProcessors() / 2).coerceAtLeast(1)
+  }
 }
 
 tasks.register("buildQa") {