[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/testData/loadJava/compiledKotlin/classObject/ClassObjectDefaultVisibility.fir.k2.txt

@@ -0,0 +1,74 @@
+public final class Int : R|kotlin/Any| {
+    public constructor(): R|test/Int|
+
+    public final companion object Companion : R|kotlin/Any| {
+        private constructor(): R|test/Int.Companion|
+
+    }
+
+}
+
+public final class Outer : R|kotlin/Any| {
+    public constructor(): R|test/Outer|
+
+    public final class Pub : R|kotlin/Any| {
+        public constructor(): R|test/Outer.Pub|
+
+        public final companion object Companion : R|kotlin/Any| {
+            private constructor(): R|test/Outer.Pub.Companion|
+
+        }
+
+    }
+
+    private final class Pri : R|kotlin/Any| {
+        public constructor(): R|test/Outer.Pri|
+
+        public final companion object Companion : R|kotlin/Any| {
+            private constructor(): R|test/Outer.Pri.Companion|
+
+        }
+
+    }
+
+    public final class Int : R|kotlin/Any| {
+        public constructor(): R|test/Outer.Int|
+
+        public final companion object Companion : R|kotlin/Any| {
+            private constructor(): R|test/Outer.Int.Companion|
+
+        }
+
+    }
+
+    protected final class Pro : R|kotlin/Any| {
+        public constructor(): R|test/Outer.Pro|
+
+        public final companion object Companion : R|kotlin/Any| {
+            private constructor(): R|test/Outer.Pro.Companion|
+
+        }
+
+    }
+
+}
+
+private final class Pri : R|kotlin/Any| {
+    public constructor(): R|test/Pri|
+
+    public final companion object Companion : R|kotlin/Any| {
+        private constructor(): R|test/Pri.Companion|
+
+    }
+
+}
+
+public final class Pub : R|kotlin/Any| {
+    public constructor(): R|test/Pub|
+
+    public final companion object Companion : R|kotlin/Any| {
+        private constructor(): R|test/Pub.Companion|
+
+    }
+
+}