Page List: Fix Notice component background gets incorrectly inherited

[yogeshbhutkar]

What?

Closes #70929

This PR fixes the issue where the notice component's background is incorrectly inherited, causing it to become invisible.

Why?

The .wp-block-page-list > div rule overrides the background-color defined within .components-notice.

How?

The following styles were removed.

gutenberg/packages/block-library/src/page-list/editor.scss

Lines 2 to 6 in d07eb03

	// Block wrapper gets the classes in the editor, and there's an extra div wrapper for now, so background styles need to be inherited.
	.wp-block-page-list > div,
	.wp-block-page-list {
	background-color: inherit;
	}

I can confirm that there's no extra div as the ServerSideRender component was removed, therefore making .wp-block-page-list > div rule unnecessary.

Ref.

With ServerSideRender	Without ServerSideRender (Trunk)

I've tested this across various scenarios, including custom colors, backgrounds, and submenu overlays applied to the parent Navigation block, and it appears to be working as expected. However, I recommend thorough testing to help identify any potential edge cases.

Testing Instructions

1. Select a style with a dark background. For Twenty Twenty-Five, for example, "Evening".
2. Ensure that there are no published pages.
3. Create a new post and insert the Page List block.
4. Ensure that the Notice is properly displayed and has a proper background.

Testing Instructions for Keyboard

Same.

Screenshots

Before	After

[yogeshbhutkar]

The .wp-block-page-list rule was also removed as it appeared redundant, as it's also defined within the corresponding style.scss file.

See:

gutenberg/packages/block-library/src/page-list/style.scss

Line 9 in 094eb82

background-color: inherit;

[github-actions]

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Co-authored-by: yogeshbhutkar <yogeshbhutkar@git.wordpress.org>
Co-authored-by: t-hamano <wildworks@git.wordpress.org>

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[t-hamano]

LGTM! Good to know we can safely remove this style.