[SPARK-53830] Exclude .idea directory from Spotless check

Author: dongjoon-hyun

build.gradle

@@ -129,6 +129,7 @@ apply plugin: 'com.diffplug.spotless'
 spotless {
   format 'misc', {
     target '*.md', '*.gradle', '**/*.properties', '**/*.xml', '**/*.yaml', '**/*.yml'
+    targetExclude "**/.idea/**"
     endWithNewline()
     trimTrailingWhitespace()
   }