Use kotlin.test.Test instead of org.junit.Test in common stdlib tests

(and in jvm-only and js-only tests also)

libraries/stdlib/test/text/CharJVMTest.kt

@@ -2,7 +2,6 @@
 package test.text
 
 import kotlin.test.*
-import org.junit.Test
 
 class CharJVMTest {
 

libraries/stdlib/test/text/RegexJVMTest.kt

@@ -18,7 +18,6 @@
 package test.text
 
 import kotlin.test.*
-import org.junit.Test
 import test.collections.compare
 import test.io.*
 import java.util.regex.Pattern

libraries/stdlib/test/text/RegexTest.kt

@@ -3,7 +3,6 @@ package test.text
 import kotlin.text.*
 
 import kotlin.test.*
-import org.junit.Test
 
 class RegexTest {
 

libraries/stdlib/test/text/StringBuilderJVMTest.kt

@@ -2,7 +2,6 @@
 package test.text
 
 import kotlin.test.*
-import org.junit.Test
 
 class StringBuilderJVMTest() {
 

libraries/stdlib/test/text/StringBuilderTest.kt

@@ -1,7 +1,6 @@
 package test.text
 
 import kotlin.test.*
-import org.junit.Test
 
 class StringBuilderTest {
 

libraries/stdlib/test/text/StringJVMTest.kt

@@ -5,7 +5,6 @@ import test.collections.assertArrayNotSameButEquals
 import java.util.*
 import kotlin.test.*
 
-import org.junit.Test
 
 class StringJVMTest {
 

libraries/stdlib/test/text/StringNumberConversionTest.kt

@@ -1,7 +1,6 @@
 package test.text
 
 import kotlin.test.*
-import org.junit.Test
 
 class StringNumberConversionTest {
 

libraries/stdlib/test/text/StringTest.kt

@@ -18,7 +18,6 @@ package test.text
 
 import kotlin.test.*
 import test.*
-import org.junit.Test
 import test.collections.behaviors.iteratorBehavior
 import test.collections.compare