Build: Kotlin daemon 6g -> 8g, switch to G1GC, disable GC overhead limit

Release builds with K2 FIR on this codebase hit GC overhead limit
at 6G. 8G + G1 leaves plenty of headroom on the 24G host.

gradle.properties

@@ -7,7 +7,7 @@ org.gradle.daemon=true
 org.gradle.parallel=false
 org.gradle.caching=true
 
-kotlin.daemon.jvmargs=-Xmx6g -XX:MaxMetaspaceSize=1024m
+kotlin.daemon.jvmargs=-Xmx8g -XX:MaxMetaspaceSize=1024m -XX:+UseG1GC -XX:-UseGCOverheadLimit -XX:+HeapDumpOnOutOfMemoryError
 kotlin.incremental=true
 
 org.gradle.configuration-cache=false