Remove sparkr and any references to it

[StrongestNumber9]

Description

Remove sparkr loading from

Remove sparkr and any references to it

Use case or motivation behind the feature request

We do not use or support R. While we do not build or ship sparkr in this project, there is no reason upload it in every single spark application launch as it is just extra weight for no reason.

Including, but limited to, this part.

zep_01/zeppelin-zengine/src/main/java/org/apache/zeppelin/interpreter/launcher/SparkInterpreterLauncher.java

Lines 344 to 369 in e233bda

	private void setupPropertiesForSparkR(Properties sparkProperties) {
	if (isYarnMode()) {
	String sparkHome = getEnv("SPARK_HOME");
	File sparkRBasePath = null;
	if (sparkHome == null) {
	if (!getSparkMaster().startsWith("local")) {
	throw new RuntimeException("SPARK_HOME is not specified in interpreter-setting" +
	" for non-local mode, if you specify it in zeppelin-env.sh, please move that into " +
	" interpreter setting");
	}
	String zeppelinHome = zConf.getString(ZeppelinConfiguration.ConfVars.ZEPPELIN_HOME);
	sparkRBasePath = new File(zeppelinHome,
	"interpreter" + File.separator + "spark" + File.separator + "R");
	} else {
	sparkRBasePath = new File(sparkHome, "R" + File.separator + "lib");
	}
	File sparkRPath = new File(sparkRBasePath, "sparkr.zip");
	if (sparkRPath.exists() && sparkRPath.isFile()) {
	mergeSparkProperty(sparkProperties, "spark.yarn.dist.archives",
	sparkRPath.getAbsolutePath() + "#sparkr");
	} else {
	LOGGER.warn("sparkr.zip is not found, SparkR may not work.");
	}
	}
	}

Related issues

Additional context