[Analysis API] Add more ContextCollector tests inspired by on-air tests

As the on-air analysis is obsolete, related tests are going to be
deleted. Here we add cases not yet covered by 'ContextCollector' tests.

analysis/low-level-api-fir/testData/contextCollector/localClassFunction.kt

@@ -0,0 +1,9 @@
+fun test() {
+    class Local {
+        fun foo(): String {
+            <expr>return "foo"</expr>
+        }
+    }
+
+    Local().foo()
+}