FIR IDE: enable override implement test for FIR

idea/testData/codeInsight/overrideImplement/androidxNotNull/foo/Impl.kt.fir.after

@@ -0,0 +1,10 @@
+import androidx.annotation.RecentlyNonNull
+import androidx.annotation.RecentlyNullable
+import foo.A
+
+class B : A() {
+    @RecentlyNonNull
+    override fun foo(@RecentlyNonNull s1: String, @RecentlyNullable s2: String?): String {
+        <selection><caret>return super.foo(s1, s2)</selection>
+    }
+}