UnitControl: Fix an issue where keyboard shortcuts unintentionally shift focus on Windows OS

[t-hamano]

Follow-up #39303
Fixes #62967

What?

This PR fixes an issue where the focus unintentionally moves to the unit when executing the paste shortcut (Ctrl+V) in an input field on Windows OS.

Why?

Only event.metaKey is checked to give focus to the unit, which may work on MacOS, but on Windows OS the Ctrl key is event.ctrlKey.

Testing Instructions

The following are test procedures for Windows OS, but they should continue to work as expected on MacOS.

• Run the Storybook.
• Access localhost:50240/?path=/docs/components-experimental-unitcontrol--docs
• Copy the numbers beforehand.
• Run Ctrl+V in the input field.
• The copied numbers should be pasted.
• Press only the p, v or e key.
• The focus should move to the unit, and the unit should change according to the key pressed.

Screenshots or screencast

After.mp4

[github-actions]

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[github-actions]

Flaky tests detected in cbe9098.
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/9721840478
📝 Reported issues:

• [Flaky Test] Create a pattern with overrides #58009 in /test/e2e/specs/editor/various/pattern-overrides.spec.js

[tyxla]

LGTM, thanks @t-hamano 🙌

I'd only update the inline comment above your change before shipping.

Otherwise, ready to 🚀

[tyxla]

Let's also update the comment above (to reference the ctrl key in addition to the meta key).

[t-hamano]

Thanks for the review! Updated by b90cc5a