[Analysis API] add diagnostic tests for unresolved reference inside primary constructor

^KT-62437

analysis/low-level-api-fir/testData/getOrBuildFir/wholeDeclaration/enum.kt

@@ -0,0 +1,12 @@
+<expr>
+enum class MyClass(val i: Int = foo()) : UnresolvedInterface {
+    ENTRY1,
+    ENTRY2(42);
+
+    fun boo(a: String) {
+
+    }
+}
+</expr>
+
+fun foo() = 42