[AA] Flatten composite scopes when building scope context for position

^KTIJ-25048 Fixed

analysis/analysis-api/testData/referenceResolve/kDoc/localContext/SelfNonLocalEnumEntry.kt

@@ -0,0 +1,10 @@
+enum class E {
+    /**
+     * [A<caret>A]
+     */
+    AA, BB;
+
+    companion object {
+        fun f() {}
+    }
+}

analysis/analysis-api/testData/referenceResolve/kDoc/localContext/SelfNonLocalEnumEntry.txt

@@ -0,0 +1,2 @@
+Resolved to:
+0: (in E) AA