Fix Button size violations in misc. unit tests

[mirka]

In preparation for #65751

What?

Fixes some remaining Button size violations in unit tests.

Why?

So they do not log deprecation warnings when we start logging them for Button.

(FYI there are more violations remaining, but will be in logically-grouped PRs for easier review.)

Testing Instructions

✅ Unit tests still pass, and no functional changes.

[github-actions]

Flaky tests detected in 99af43e.
Some tests passed with failed attempts. The failures may not be related to this commit but are still reported for visibility. See the documentation for more information.

🔍 Workflow run URL: https://github.com/WordPress/gutenberg/actions/runs/12421446833
📝 Reported issues:

• [Flaky Test] Navigates the items list via UP/DOWN arrow keys #64334 in /test/e2e/specs/site-editor/dataviews-list-layout-keyboard.spec.js
• [Flaky Test] submenu click on the arrow interactions #61884 in /test/e2e/specs/editor/blocks/navigation-frontend-interactivity.spec.js

[github-actions]

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Co-authored-by: mirka <[email protected]>
Co-authored-by: ciampo <[email protected]>
Co-authored-by: tyxla <[email protected]>

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[ciampo]

🚀

[tyxla]

LGTM 👍

So cool to see we're almost there 🚀