Remove leftovers of platformName and platformStatic in test data

Drop unnecessary imports, rename some tests

compiler/testData/codegen/boxWithJava/jvmStatic/annotations.kt

@@ -1,6 +1,5 @@
 // FILE: Test.java
 
-import java.lang.String;
 import java.lang.annotation.Annotation;
 
 class Test {
@@ -31,8 +30,6 @@ class Test {
 
 // FILE: test.kt
 
-import kotlin.jvm.JvmStatic
-
 @Retention(AnnotationRetention.RUNTIME)
 annotation class testAnnotation
 

compiler/testData/codegen/boxWithJava/jvmStatic/enumCompanion.kt

@@ -20,8 +20,6 @@ class Test {
 
 // FILE: enumCompanionObject.kt
 
-import kotlin.jvm.JvmStatic
-
 enum class A {
     ;
     companion object {

compiler/testData/codegen/boxWithJava/jvmStatic/object.kt

@@ -22,8 +22,6 @@ class Test {
 
 // FILE: simpleObject.kt
 
-import kotlin.jvm.JvmStatic
-
 object A {
 
     val b: String = "OK"