[LL FIR] introduce lazy resolution tests for fake overrides

^KT-64243

analysis/low-level-api-fir/testData/lazyResolveScopes/intersectionOverrideScript.kts

@@ -0,0 +1,19 @@
+class <caret>A : B {
+    override fun foo(x: Int) {
+    }
+
+    override fun foo(x: String) {
+    }
+}
+
+interface B: C, D
+
+interface C {
+    fun foo(x: Int)
+    fun foo(x: String)
+}
+
+interface D {
+    fun foo(x: Int)
+    fun foo(x: String)
+}