[docs] Add Testing section to Rating component doc

[0210shivam]

This PR adds a new "Testing" section to the Rating component documentation.

Closes #38828

Motivation

When testing the Rating component in environments like Jest + jsdom, certain user interactions (e.g., hover-based selection) may not behave as expected. This is due to getBoundingClientRect() returning 0 values by default in jsdom, which can cause issues such as NaN being passed to the onChange handler.

What’s included

• A warning about the limitation in test environments that do not fully implement layout behavior.
• A recommended test pattern using fireEvent instead of userEvent.
• A note on potential pitfalls when using userEvent.click() in such contexts.

Example

fireEvent.click(screen.getByLabelText("2 Stars"));

• I have followed (at least) the PR section of the contributing guide.

[mui-bot]

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• docs/data/material/components/rating/rating.md

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[DiegoAndai]

Hey @mapache-salvaje! May I assign you for review of this docs addition? thanks!

[mapache-salvaje]

Some small copyedits here, otherwise LGTM!

[0210shivam]

Hi @DiegoAndai ,The PR has been reviewed and updated with some changes. Could you please proceed further when you get a chance? Thanks!

[DiegoAndai]

Thanks @0210shivam

[0210shivam]

Thanks @0210shivam

My pleasure! Thanks for the opportunity — excited to keep contributing to MUI.