test(@toss/react): Add usePreservedCallback test code

[nakjun12]

Overview

This PR adds tests for the usePreservedCallback hook:

1. Checks if the hook returns updated values after state changes.
2. Ensures the callback reference is constant after state updates.
3. Verifies that arguments are correctly passed to the callback.

[ AS-IS ]
❌

[ TO-BE ]

PR Checklist

• I read and included theses actions below

1. I have read the Contributing Guide
2. I have written documents and tests, if needed.

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[okinawaa]

Cool 😎