[easy] remove unused file MaxInts.js (#27259)

While poking around, I noticed this wasn't used.

packages/react-reconciler/src/MaxInts.js

@@ -1,13 +0,0 @@
-/**
- * Copyright (c) Meta Platforms, Inc. and affiliates.
- *
- * This source code is licensed under the MIT license found in the
- * LICENSE file in the root directory of this source tree.
- *
- * @flow
- */
-
-// Max 31 bit integer. The max integer size in V8 for 32-bit systems.
-// Math.pow(2, 30) - 1
-// 0b111111111111111111111111111111
-export const MAX_SIGNED_31_BIT_INT = 1073741823;