Use KotlinCoreEnvironment.createForTests in test code

createForProduction creates and caches JavaCoreApplicationEnvironment
instance, which can alter behavior of subsequent tests

libraries/tools/kotlin-script-util/src/test/kotlin/org/jetbrains/kotlin/script/util/ScriptUtilIT.kt

@@ -145,7 +145,7 @@ done
                 put(JVMConfigurationKeys.RETAIN_OUTPUT_IN_MEMORY, true)
             }
 
-            val environment = KotlinCoreEnvironment.createForProduction(rootDisposable, configuration, EnvironmentConfigFiles.JVM_CONFIG_FILES)
+            val environment = KotlinCoreEnvironment.createForTests(rootDisposable, configuration, EnvironmentConfigFiles.JVM_CONFIG_FILES)
 
             try {
                 return KotlinToJVMBytecodeCompiler.compileScript(environment)
@@ -166,12 +166,6 @@ done
         }
     }
 
-    private inline fun <R> ifFailed(default: R, block: () -> R) = try {
-        block()
-    } catch (t: Throwable) {
-        default
-    }
-
     private fun String.linesSplitTrim() =
             split('\n','\r').map(String::trim).filter(String::isNotBlank)