Fixture for pruning unmemoized nonreactive deps

Adds a fixture for our existing behavior that reactive scope dependencies 
exclude values which are non-reactive. The idea is that regardless of whether 
the value may actually get recreated over time or not, a "nonreactive" value 
cannot semantically change and therefore we can ignore changes in its pointer 
address.

compiler/packages/babel-plugin-react-forget/src/__tests__/fixtures/compiler/unmemoized-nonreactive-dependency-is-pruned-as-dependency.expect.md

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+
+## Input
+
+```javascript
+import { mutate, useNoAlias } from "shared-runtime";
+
+function Component(props) {
+  // Here `x` cannot be memoized bc its mutable range spans a hook call:
+  const x = [];
+  useNoAlias();
+  mutate(x);
+
+  // However, `x` is non-reactive. It cannot semantically change, so we
+  // exclude it as a dependency of the JSX element:
+  return <div>{x}</div>;
+}
+
+export const FIXTURE_ENTRYPOINT = {
+  fn: Component,
+  params: [{ value: 42 }],
+};
+
+```
+
+## Code
+
+```javascript
+import { unstable_useMemoCache as useMemoCache } from "react";
+import { mutate, useNoAlias } from "shared-runtime";
+
+function Component(props) {
+  const $ = useMemoCache(1);
+
+  const x = [];
+  useNoAlias();
+  mutate(x);
+  let t0;
+  if ($[0] === Symbol.for("react.memo_cache_sentinel")) {
+    t0 = <div>{x}</div>;
+    $[0] = t0;
+  } else {
+    t0 = $[0];
+  }
+  return t0;
+}
+
+export const FIXTURE_ENTRYPOINT = {
+  fn: Component,
+  params: [{ value: 42 }],
+};
+
+```
+      
+### Eval output
+(kind: ok) <div></div>

compiler/packages/babel-plugin-react-forget/src/__tests__/fixtures/compiler/unmemoized-nonreactive-dependency-is-pruned-as-dependency.js

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+import { mutate, useNoAlias } from "shared-runtime";
+
+function Component(props) {
+  // Here `x` cannot be memoized bc its mutable range spans a hook call:
+  const x = [];
+  useNoAlias();
+  mutate(x);
+
+  // However, `x` is non-reactive. It cannot semantically change, so we
+  // exclude it as a dependency of the JSX element:
+  return <div>{x}</div>;
+}
+
+export const FIXTURE_ENTRYPOINT = {
+  fn: Component,
+  params: [{ value: 42 }],
+};