[Fiber] Warn when useMemo is called with a non-function first argument

[ousamabenyounes]

Summary

Fixes #16589.

When useMemo was called with a non-function first argument (a common mistake, e.g. passing the memoized value directly instead of a factory), React threw TypeError: nextCreate is not a function from inside mountMemo. The stack pointed at React internals and most developers had no idea what nextCreate referred to — the error didn't name the hook or the component involved.

Add a DEV-only warning mirroring the existing Expected useImperativeHandle() second argument to be a function warning. The DEV warning fires before the TypeError and names the hook plus the actual typeof of the value received, so the developer sees a component-attributed message pointing at their own code:

Expected useMemo() first argument to be a function that returns a value. Instead received: object.
in App (at …)

Prod behaviour is unchanged — the TypeError: nextCreate is not a function still surfaces as before.

Repro

function App() {
  // Common mistake — `useMemo` expects a factory, not the value itself.
  const value = useMemo({result: 1}, []);
  return value.result;
}

Before: TypeError: nextCreate is not a function with a stack inside react-dom.development.js, no hint at which component/hook.
After: DEV warning names useMemo() + the actual type (object) with a component stack, then the TypeError surfaces if the bug isn't fixed.

How did you test this change?

• New test warns when useMemo is called with a non-function first argument in ReactHooks-test.internal.js — models on the neighbouring warns for bad useImperativeHandle … tests.
• yarn test ReactHooks-test: 73 passed / 0 failed (72 baseline + 1 new).
• yarn test --prod ReactHooks-test: 72 passed / 0 failed — the assertConsoleErrorDev assertion is a no-op in prod and the rejects.toThrow still holds.
• yarn test ReactHooksWithNoopRenderer-test: 96 passed / 0 failed.
• yarn test useMemoCache: 7 passed / 0 failed.
• yarn flow dom-node — clean.
• yarn linc — clean.
• yarn prettier — clean.

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