Update build optimizations (#6433)

core/build.gradle.kts

@@ -68,15 +68,3 @@ kotlin {
         jvmTarget = JvmTarget.fromTarget(libs.versions.jvmTarget.get())
     }
 }
-
-tasks.withType<Test>().configureEach {
-    useJUnitPlatform()
-    @Suppress("MagicNumber")
-    forkEvery = 100
-    maxHeapSize = "2g"
-    maxParallelForks = (Runtime.getRuntime().availableProcessors() / 2).coerceAtLeast(1)
-    jvmArgs = jvmArgs.orEmpty() + "-XX:+UseParallelGC" +
-        // Explicitly setting the user Country and Language because tests assume en-US
-        "-Duser.country=US" +
-        "-Duser.language=en"
-}