[Native][tests] Introduce NATIVE_STANDALONE directive

This directive makes the test standalone, i.e. disables grouping it with
other tests into a single compilation, and in particular disables
package renaming for the test.

Also, remove the old hard-coded way to mark tests standalone.

compiler/testData/codegen/box/annotations/instances/annotationToString.kt

@@ -2,6 +2,11 @@
 // IGNORE_BACKEND: WASM
 // DONT_TARGET_EXACT_BACKEND: JS
 
+// This test fails on Native with test grouping and package renaming enabled,
+// because the latter doesn't yet handle annotation toString implementations properly.
+// Disable test grouping as a workaround:
+// NATIVE_STANDALONE
+
 // WITH_STDLIB
 // !LANGUAGE: +InstantiationOfAnnotationClasses
 

native/native.tests/tests/org/jetbrains/kotlin/konan/blackboxtest/support/group/ExtTestCaseGroupProvider.kt

@@ -77,7 +77,7 @@ internal class ExtTestCaseGroupProvider : TestCaseGroupProvider, TestDisposable(
 
                 if (extTestDataFile.isRelevant)
                     testCases += extTestDataFile.createTestCase(
-                        definitelyStandaloneTest = settings.get<ForcedStandaloneTestKind>().value || testDataFile in standalones,
+                        definitelyStandaloneTest = settings.get<ForcedStandaloneTestKind>().value,
                         sharedModules = sharedModules
                     )
                 else
@@ -87,14 +87,6 @@ internal class ExtTestCaseGroupProvider : TestCaseGroupProvider, TestDisposable(
             TestCaseGroup.Default(disabledTestCaseIds, testCases)
         }
     }
-
-    companion object {
-        /** Tests that should be compiled and executed as standalone tests. */
-        private val standalones: Set<File> = listOf(
-            // Comparison of type information obtained with reflection against non-patched string literal:
-            "compiler/testData/codegen/box/annotations/instances/annotationToString.kt"
-        ).mapToSet(::getAbsoluteFile)
-    }
 }
 
 private class ExtTestDataFile(
@@ -176,6 +168,8 @@ private class ExtTestDataFile(
      * - test is compiled independently of any other tests
      */
     private fun determineIfStandaloneTest(): Boolean = with(structure) {
+        if (directives.contains(NATIVE_STANDALONE_DIRECTIVE)) return true
+
         var isStandaloneTest = false
 
         filesToTransform.forEach { handler ->
@@ -589,6 +583,8 @@ private class ExtTestDataFile(
         private const val EXPECT_ACTUAL_LINKER_DIRECTIVE = "EXPECT_ACTUAL_LINKER"
         private const val USE_EXPERIMENTAL_DIRECTIVE = "USE_EXPERIMENTAL"
 
+        private const val NATIVE_STANDALONE_DIRECTIVE = "NATIVE_STANDALONE"
+
         private const val OPT_IN_DIRECTIVE = "OPT_IN"
         private val OPT_INS_PURELY_FOR_COMPILER = setOf(
             OptInNames.REQUIRES_OPT_IN_FQ_NAME.asString()