[Kotlin] Use test disposable for cleaning test registry value

KTIJ-29725

GitOrigin-RevId: 1ede31b498132da569b45f77bc618f0e03abe996

plugins/kotlin/test-framework/test/org/jetbrains/kotlin/idea/test/KotlinLightMultiplatformCodeInsightFixtureTestCase.kt

@@ -61,17 +61,12 @@ abstract class KotlinLightMultiplatformCodeInsightFixtureTestCase : KotlinLightC
         return TestProjectFiles(allFiles, mainFile)
     }
 
-    private var isKotlinK2KmpEnabledBeforeTest: Boolean? = null
-
     override fun setUp() {
         super.setUp()
 
-        Registry.get("kotlin.k2.kmp.enabled").let { registryValue ->
-            isKotlinK2KmpEnabledBeforeTest = registryValue.asBoolean()
-            registryValue.setValue(true)
-        }
+        Registry.get("kotlin.k2.kmp.enabled").setValue(true, testRootDisposable)
 
-        // sync is necessary for to detect unexpected disappearances of library files
+        // sync is necessary to detect unexpected disappearances of library files
         VfsTestUtil.syncRefresh()
     }
 
@@ -79,7 +74,6 @@ abstract class KotlinLightMultiplatformCodeInsightFixtureTestCase : KotlinLightC
         runAll(
             { KotlinMultiPlatformProjectDescriptor.cleanupSourceRoots() },
             { KotlinSdkType.removeKotlinSdkInTests() },
-            { Registry.get("kotlin.k2.kmp.enabled").setValue(isKotlinK2KmpEnabledBeforeTest == true) },
             { super.tearDown() },
         )
     }

plugins/kotlin/test-framework/test/org/jetbrains/kotlin/idea/test/KotlinMultiPlatformProjectDescriptor.kt

@@ -28,12 +28,13 @@ import org.jetbrains.kotlin.platform.konan.NativePlatforms
 
 /**
  * The project is created with the following module structure:
+ * ```
  * Common --- Js
  *       \--- Jvm
  *       \--- Native --- MinGW
  *                  \--- Linux --- LinuxX64
  *                            \--- LinuxArm64
- *
+ * ```
  * Standard library and kotlinx-coroutines-core of fixed versions are added to all modules.
  *
  * Apple targets require a Mac host and therefore are not included in the test project.