[FIR Test] Migrate AbstractFirLoadCompiledKotlin to new test infrastructure

Also introduce two different modes for those tests:
- load metadata compiled with K1
- load metadata compiled with K2

compiler/tests-common-new/tests/org/jetbrains/kotlin/test/directives/CodegenTestDirectives.kt

@@ -218,6 +218,18 @@ object CodegenTestDirectives : SimpleDirectivesContainer() {
             Ignore FIR2IR exceptions if FIR reported some diagnostics with ERROR severity
         """.trimIndent()
     )
+
+    val IGNORE_FIR_METADATA_LOADING_K1 by directive(
+        description = """
+            Ignore exceptions in AbstractFirLoadK1CompiledKotlin tests
+        """.trimIndent()
+    )
+
+    val IGNORE_FIR_METADATA_LOADING_K2 by directive(
+        description = """
+            Ignore exceptions in AbstractFirLoadK2CompiledKotlin tests
+        """.trimIndent()
+    )
 }
 
 fun extractIgnoredDirectivesForTargetBackend(

compiler/tests-common-new/tests/org/jetbrains/kotlin/test/runners/AbstractKotlinCompilerTest.kt

@@ -69,15 +69,8 @@ abstract class AbstractKotlinCompilerTest {
     }
 
     @BeforeEach
-    @OptIn(ExperimentalStdlibApi::class)
     fun initTestInfo(testInfo: TestInfo) {
-        initTestInfo(
-            KotlinTestInfo(
-                className = testInfo.testClass.getOrNull()?.name ?: "_undefined_",
-                methodName = testInfo.testMethod.getOrNull()?.name ?: "_testUndefined_",
-                tags = testInfo.tags
-            )
-        )
+        initTestInfo(testInfo.toKotlinTestInfo())
     }
 
     fun initTestInfo(testInfo: KotlinTestInfo) {
@@ -109,3 +102,11 @@ abstract class AbstractKotlinCompilerTest {
         }.runTest(filePath)
     }
 }
+
+fun TestInfo.toKotlinTestInfo(): KotlinTestInfo {
+    return KotlinTestInfo(
+        className = this.testClass.getOrNull()?.name ?: "_undefined_",
+        methodName = this.testMethod.getOrNull()?.name ?: "_testUndefined_",
+        tags = this.tags
+    )
+}