Fix: The focus styles for tabPanel.

[vipul0425]

What?

Fixes #60663
When a tab panel is focused, the focus ring styles differ from those of the Tabs component. The main distinctions lie in the color and outline width, as no styles are added for the tab items, and user agent styles are applicable to them.

Why?

This PR resolves the inconsistency between the focus styles for TabPanel and Tabs component.

How?

This PR adds the box-shadow and outline styles for the class .components-tab-panel__tab-content

Testing Instructions

1. Open the Storybook and navigate to the TabPanel component.
2. Either use the "Tab" key to navigate to the tabs or inspect the div below the Tabs labeled "Selected tab: Tab 1" and apply the focus:visible state to it.
3. You can observe the styles there and compare them with the Tabs components under experimental components as well.

Testing Instructions for Keyboard

Nil

Screenshots or screencast

Before

After

[github-actions]

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Co-authored-by: vipul0425 <[email protected]>
Co-authored-by: mirka <[email protected]>
Co-authored-by: alpha951 <[email protected]>

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[github-actions]

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[vipul0425]

@WordPress/gutenberg-components Can you please review it.

[mirka]

Perfect, thank you!

Could you merge or rebase this PR onto current trunk and add a changelog for this as a bug fix please? Then we can merge 🚀

[vipul0425]

Hi, @mirka Updated the changelog and merged trunk into this.
Thanks 🙇