Migrate impl to actual in libraries projects

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/resources/testProject/multiplatformProject/libJs/src/main/kotlin/PlatformClass.kt

@@ -1,5 +1,5 @@
 package foo
 
-impl class PlatformClass {
-    impl val value: String = "JS"
+actual class PlatformClass {
+    actual val value: String = "JS"
 }

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/resources/testProject/multiplatformProject/libJs/src/test/kotlin/PlatformTest.kt

@@ -1,5 +1,5 @@
 package foo
 
-impl class PlatformTest {
-    impl val value: PlatformClass = PlatformClass()
+actual class PlatformTest {
+    actual val value: PlatformClass = PlatformClass()
 }

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/resources/testProject/multiplatformProject/libJvm/src/main/kotlin/PlatformClass.kt

@@ -1,5 +1,5 @@
 package foo
 
-impl class PlatformClass {
-    impl val value: String = "JVM"
+actual class PlatformClass {
+    actual val value: String = "JVM"
 }

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/resources/testProject/multiplatformProject/libJvm/src/test/kotlin/PlatformTest.kt

@@ -1,5 +1,5 @@
 package foo
 
-impl class PlatformTest {
-    impl val value: PlatformClass = PlatformClass()
+actual class PlatformTest {
+    actual val value: PlatformClass = PlatformClass()
 }

libraries/tools/kotlin-maven-plugin-test/src/it/test-multiplatform/js/src/main/kotlin/org/jetbrains/HelloWorld.kt

@@ -4,6 +4,6 @@ fun main(args: Array<String>) {
     doMain()
 }
 
-impl fun doMain() {
+actual fun doMain() {
     console.info(getGreeting())
 }

libraries/tools/kotlin-maven-plugin-test/src/it/test-multiplatform/jvm/src/main/kotlin/org/jetbrains/HelloWorld.kt

@@ -4,6 +4,6 @@ fun main(args : Array<String>) {
     doMain()
 }
 
-impl fun doMain() {
+actual fun doMain() {
     System.out?.println(getGreeting())
 }