Filter sbt output in Makefile and remove deprecated showSuccess

- Pipe sbt output through grep '^scala,' to avoid sbt launcher
  messages and netlib warnings polluting the CSV
- Redirect sbt stderr to /dev/null
- Remove deprecated showSuccess setting that caused lint warning

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: ViralBShah

Makefile

@@ -98,7 +98,7 @@ benchmarks/java.csv: java/src/main/java/PerfBLAS.java
 
 benchmarks/scala.csv: scala/src/main/scala/perf.scala scala/build.sbt
 	cd scala
-	@for t in $(ITERATIONS); do sbt --batch run; done >../$@
+	@for t in $(ITERATIONS); do sbt --batch run 2>/dev/null | grep '^scala,'; done >../$@
 
 benchmarks/rust.csv: rust/src/main.rs rust/src/util.rs rust/Cargo.toml
 	cd rust

scala/build.sbt

@@ -4,8 +4,6 @@ scalaVersion := "3.3.4"
 
 libraryDependencies += "org.scalanlp" %% "breeze" % "2.1.0"
 
-showSuccess := false
-
 onLoadMessage := ""
 
 logLevel := Level.Warn