Add failing test for DropMemoCalls failing to DCE dep array

Found this while running Forget on the React tests. 

This isn't a high priority because the ESLint plugin would've caught this. But 
it'd be nice if either our validation rules caught this or if our compiler did 
correctly eliminate the dep array.

compiler/forget/packages/babel-plugin-react-forget/src/__tests__/fixtures/compiler/bug.useMemo-deps-array-not-cleared.expect.md

@@ -0,0 +1,41 @@
+
+## Input
+
+```javascript
+function App({text, hasDeps}) {
+  const resolvedText = useMemo(
+    () => {
+      return text.toUpperCase();
+    },
+    hasDeps ? null : [text], // should be DCE'd
+  );
+  return resolvedText;
+}
+
+```
+
+## Code
+
+```javascript
+import { unstable_useMemoCache as useMemoCache } from "react";
+function App(t26) {
+  const $ = useMemoCache(2);
+  const { text, hasDeps } = t26;
+
+  hasDeps ? null : [text];
+  const c_0 = $[0] !== text;
+  let t0;
+  if (c_0) {
+    t0 = text.toUpperCase();
+    $[0] = text;
+    $[1] = t0;
+  } else {
+    t0 = $[1];
+  }
+  const t19 = t0;
+  const resolvedText = t19;
+  return resolvedText;
+}
+
+```
+      

compiler/forget/packages/babel-plugin-react-forget/src/__tests__/fixtures/compiler/bug.useMemo-deps-array-not-cleared.js

@@ -0,0 +1,9 @@
+function App({ text, hasDeps }) {
+  const resolvedText = useMemo(
+    () => {
+      return text.toUpperCase();
+    },
+    hasDeps ? null : [text] // should be DCE'd
+  );
+  return resolvedText;
+}