[Gradle] Add ExperimentalForeignApi opt-ins to integration tests

3f3f6eb marks all cinterop-generated declarations with
@ExperimentalForeignApi. As a result, all usages of such declarations
have to opt-in explicitly. This commit adds those opt-ins to all
usages in the Kotlin Gradle plugin integration tests.

^KT-58362

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/kotlin/org/jetbrains/kotlin/gradle/native/CinteropIT.kt

@@ -26,7 +26,7 @@ class CinteropIT : KGPBaseTest() {
             headerFile.writeText("void foo();")
             buildAndFail(":compileKotlinLinux") {
                 assertTasksExecuted(":cinteropNlibLinux")
-                assertOutputContains("src/linuxMain/kotlin/org/sample/Platform.kt:2:10 Unresolved reference: sample")
+                assertOutputContains("src/linuxMain/kotlin/org/sample/Platform.kt:3:10 Unresolved reference: sample")
             }
 
             headerFile.writeText("void sample(int i);")

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/resources/testProject/cinterop-kt-53191/src/linuxMain/kotlin/org/sample/Platform.kt

@@ -1,3 +1,4 @@
 fun foo() {
+    @OptIn(kotlinx.cinterop.ExperimentalForeignApi::class)
     nlib.sample(5)
 }

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/resources/testProject/cinteropImport/dep-with-cinterop/src/commonMain/kotlin/pkg/common.kt

@@ -3,5 +3,6 @@ package pkg
 import dep.*
 
 class DependencyKotlinClass {
+    @OptIn(kotlinx.cinterop.ExperimentalForeignApi::class)
     val mode: Dependency = Dependency.GOO
 }

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/resources/testProject/commonize-kt-46248-singleNativeTargetPropagation/p1/src/nativeMain/kotlin/commonMain.kt

@@ -7,4 +7,5 @@ fun nativeMain() {
     usleep(100u)
 }
 
+@OptIn(kotlinx.cinterop.ExperimentalForeignApi::class)
 fun nativeMainUsingCInterop() = dummyFunction()

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/resources/testProject/commonize-kt-46248-singleNativeTargetPropagation/p1/src/nativeMainParent/kotlin/NativeMainParent.kt

@@ -8,4 +8,5 @@ fun commonMain() {
     usleep(100u)
 }
 
+@OptIn(kotlinx.cinterop.ExperimentalForeignApi::class)
 fun nativeMainParentUsingCInterop() = dummyFunction()

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/resources/testProject/commonize-kt-46248-singleNativeTargetPropagation/p1/src/nativePlatformMain/kotlin/NativePlatformMain.kt

@@ -7,4 +7,5 @@ fun main() {
     usleep(100u)
 }
 
+@OptIn(kotlinx.cinterop.ExperimentalForeignApi::class)
 fun nativePlatformMainUsingCInterop() = dummyFunction()

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/resources/testProject/commonize-kt-47523-singleNativeTargetPropagation-cinterop/src/commonMain/kotlin/CommonMain.kt

@@ -2,4 +2,5 @@
 
 import dummy.dummyFunction
 
+@OptIn(kotlinx.cinterop.ExperimentalForeignApi::class)
 fun commonMain() = dummyFunction()

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/resources/testProject/commonize-kt-47523-singleNativeTargetPropagation-cinterop/src/nativeMain/kotlin/commonMain.kt

@@ -2,4 +2,5 @@
 
 import dummy.dummyFunction
 
+@OptIn(kotlinx.cinterop.ExperimentalForeignApi::class)
 fun nativeMain() = dummyFunction()

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/resources/testProject/commonize-kt-47523-singleNativeTargetPropagation-cinterop/src/nativePlatformMain/kotlin/NativePlatformMain.kt

@@ -2,4 +2,5 @@
 
 import dummy.dummyFunction
 
+@OptIn(kotlinx.cinterop.ExperimentalForeignApi::class)
 fun nativePlatformMain() = dummyFunction()

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/resources/testProject/commonize-kt-48856-singleNativeTargetPropagation-testSourceSet/src/platformMain/kotlin/NativeMain.kt

@@ -3,5 +3,6 @@
 import sampleInterop.sampleInterop
 
 object NativeMain {
+    @OptIn(kotlinx.cinterop.ExperimentalForeignApi::class)
     fun x() = sampleInterop()
 }

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/resources/testProject/commonize-kt-50847-cinterop-missing-in-supported-target/src/commonMain/kotlin/CommonMain.kt

@@ -1,3 +1,4 @@
 import simple.simpleInteropFunction
 
+@OptIn(kotlinx.cinterop.ExperimentalForeignApi::class)
 fun main() = simpleInteropFunction()

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/resources/testProject/commonize-kt-51517-transitive-cinterop/lib/src/commonMain/kotlin/A.kt

@@ -1,5 +1,6 @@
 import dummy.foo
 
 fun dummyMain() {
+    @OptIn(kotlinx.cinterop.ExperimentalForeignApi::class)
     foo()
 }

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/resources/testProject/commonize-kt-56729-consume-library-with-two-roots/consumer/src/commonMain/kotlin/CommonMain.kt

@@ -1,5 +1,6 @@
 object CommonMain {
     init {
+        @OptIn(kotlinx.cinterop.ExperimentalForeignApi::class)
         ProducerNativeCommonMain.fromCInterop().value
     }
 }

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/resources/testProject/commonize-kt-56729-consume-library-with-two-roots/producer/src/nativeCommonMain/kotlin/ProducerNativeCommonMain.kt

@@ -1,5 +1,6 @@
 import `producer-cinterop-library`.ProducerCLibraryStruct
 
 object ProducerNativeCommonMain {
+    @OptIn(kotlinx.cinterop.ExperimentalForeignApi::class)
     fun fromCInterop(): ProducerCLibraryStruct = error("Stub!")
 }

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/resources/testProject/mpp-composite-build/sample4-KT-37051-withCInterop/consumerBuild/consumerA/src/linuxX64Main/kotlin/ConsumerALinuxX64.kt

@@ -11,6 +11,7 @@ object ConsumerALinuxX64 {
         ProducerANative
         ProducerALinuxX64
 
+        @OptIn(kotlinx.cinterop.ExperimentalForeignApi::class)
         myCFunction()
     }
 }

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/resources/testProject/native-cinterop/projectLibrary/src/hostMain/kotlin/main.kt

@@ -6,5 +6,6 @@
 package library.cinterop.project
 
 fun projectAnswer(): Int {
+    @OptIn(kotlinx.cinterop.ExperimentalForeignApi::class)
     return getAnotherNumber() * 2
 }

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/resources/testProject/native-cinterop/publishedLibrary/src/hostMain/kotlin/main.kt

@@ -6,5 +6,6 @@
 package library.cinterop.project
 
 fun publishedAnswer(): Int {
+    @OptIn(kotlinx.cinterop.ExperimentalForeignApi::class)
     return getNumber() * 2
 }

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/resources/testProject/native-cinterop/src/hostMain/kotlin/main.kt

@@ -12,5 +12,6 @@ fun libraryAnswer(): Int {
 }
 
 fun selfCalculatedAnswer(): Int {
+    @OptIn(kotlinx.cinterop.ExperimentalForeignApi::class)
     return getNumber() * 2 + getAnotherNumber() * 2
 }

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/resources/testProject/native-cinterop/src/hostTest/kotlin/test.kt

@@ -10,5 +10,6 @@ import kotlin.test.*
 fun testAnswer() {
     assertEquals(12, libraryAnswer())
     assertEquals(12, selfCalculatedAnswer())
+    @OptIn(kotlinx.cinterop.ExperimentalForeignApi::class)
     assertEquals(5, getTestNumber())
 }