Components: Fix the Snackbar auto-dismissal timers

[Mamaduka]

What?

Resolves #58594.

PR removes onDismiss/onRemove callbacks from side-effect dependencies to avoid resetting timers on re-render.

Why?

See #58594.

Testing Instructions

1. Open a post or page.
2. Insert a block.
3. Trigger a few snackbar notices. Copying a block can do that.

Expected behavior

Let's assume there is a one-second difference between message triggers.

Message 1 - 10s
Message 2 - 10s + 1s
Message 3 - 10s + 2s

Screenshots or screencast

[github-actions]

The following accounts have interacted with this PR and/or linked issues. I will continue to update these lists as activity occurs. You can also manually ask me to refresh this list by adding the props-bot label.

Core SVN

If you're a Core Committer, use this list when committing to wordpress-develop in SVN:

Props: mamaduka, mciampini.

GitHub Merge commits

If you're merging code through a pull request on GitHub, copy and paste the following into the bottom of the merge commit message.

Co-authored-by: Mamaduka <mamaduka@git.wordpress.org>
Co-authored-by: ciampo <mciampini@git.wordpress.org>

To understand the WordPress project's expectations around crediting contributors, please review the Contributor Attribution page in the Core Handbook.

[ciampo]

Could also add a CHANGELOG entry? Thank you!

[ciampo]

What's the reason for useLayoutEffect instead of useEffect ? In theory useEffects should be called in order, so we should be guaranteed that the onDimiss and onRemove refs are always up to date

[Mamaduka]

Nothing specific. This is just a common pattern; we even have a useLatestRef hook, but I don't use here because returned value isn't recognized as Ref and linter complains.

Related: https://epicreact.dev/the-latest-ref-pattern-in-react/

[ciampo]

Thank you for the link, super interesting read!

I took a look back at this article by Kent that I usually refer to when talking useEffect and useLayoutEffect, I noticed the "special case" section too!

[ciampo]

🚀

Code changes LGTM and tests well as per instructions.
I also realised that we don't have unit tests for this component, which would have been handy here — but not in the scope for this PR.

Thank you for working on this, @Mamaduka 🙏

[Mamaduka]

Thanks for testing and review, @ciampo!