[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/compiledKotlinWithStdlib/enum/enumVisibility.fir.txt

@@ -0,0 +1,44 @@
+internal final enum class In : R|kotlin/Enum<test/In>| {
+    private constructor(): R|test/In|
+
+    public final static enum entry A: R|test/In|
+    public final static fun values(): R|kotlin/Array<test/In>| {
+    }
+
+    public final static fun valueOf(value: R|kotlin/String|): R|test/In| {
+    }
+
+    public final static val entries: R|kotlin/enums/EnumEntries<test/In>|
+        public get(): R|kotlin/enums/EnumEntries<test/In>|
+
+}
+
+private final enum class Pr : R|kotlin/Enum<test/Pr>| {
+    private constructor(): R|test/Pr|
+
+    public final static enum entry A: R|test/Pr|
+    public final static fun values(): R|kotlin/Array<test/Pr>| {
+    }
+
+    public final static fun valueOf(value: R|kotlin/String|): R|test/Pr| {
+    }
+
+    public final static val entries: R|kotlin/enums/EnumEntries<test/Pr>|
+        public get(): R|kotlin/enums/EnumEntries<test/Pr>|
+
+}
+
+public final enum class Pu : R|kotlin/Enum<test/Pu>| {
+    private constructor(): R|test/Pu|
+
+    public final static enum entry A: R|test/Pu|
+    public final static fun values(): R|kotlin/Array<test/Pu>| {
+    }
+
+    public final static fun valueOf(value: R|kotlin/String|): R|test/Pu| {
+    }
+
+    public final static val entries: R|kotlin/enums/EnumEntries<test/Pu>|
+        public get(): R|kotlin/enums/EnumEntries<test/Pu>|
+
+}