Query Title: Fix incorrect quotation marks with trailing spaces

[jorgefilipecosta]

Fixes #71854

Fixes incorrect quotation mark rendering in the Query Title block when the search term has a trailing space.

When a user searches with a trailing space (e.g., "Kitchen Sink QA Page "), the Query Title block displays incorrect quotation marks:

Before:

After:

To fix this we replace straight ASCII quotes (") with HTML entity curly quotes (“ for left and ” for right) in the translatable strings.
This follows the existing pattern already used in the comments-title block:

// packages/block-library/src/comments-title/index.php:29
$post_title = sprintf( __( '“%s”' ), get_the_title() );

Testing Instructions

1. Go to a search page: /?s=Kitchen+Sink+QA+Page+
2. Verify the title shows proper curly quotes: `Search results for: “Kitchen Sink QA Page ”
3. Test without trailing space to ensure normal behavior is preserved

[github-actions]

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Co-authored-by: jorgefilipecosta <[email protected]>
Co-authored-by: sabernhardt <[email protected]>

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[github-actions]

Flaky tests detected in 924078c.
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/20623593670
📝 Reported issues:

• [Flaky Test] should allow user to add and remove multiple local font files #62862 in /test/e2e/specs/admin/font-library.spec.js