Fix: Trac#52990 - Account for single quoted attrs

[pyronaur]

Trac ticket: https://core.trac.wordpress.org/ticket/52990

This PR accounts for attributes using single quotes in images and iframes to address the issue described in Trac:52990

[github-actions]

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[pyronaur]

Looked at the broken unit tests - it seems that they might be broken at a repository level and nothing to do with the patch?

[ocean90]

Hi @pyronaur, there are actually two failing tests. Here's the direct link: https://github.com/WordPress/wordpress-develop/pull/1358/checks?check_run_id=2782515804#step:20:274

[pyronaur]

Thanks @ocean90

Curious - there are tests that assert that single quotes should fail 🤔 .

1) Tests_Media::test_wp_img_tag_add_loading_attr_with_single_quotes
Failed asserting that '<img loading="lazy" src='example.png' alt=' width='300' height='225' />' does not contain " loading=".

/var/www/tests/phpunit/tests/media.php:2886

2) Tests_Media::test_wp_iframe_tag_add_loading_attr_with_single_quotes
Failed asserting that '<iframe loading="lazy" src='https://www.example.com' width='640' height='360'></iframe>' does not contain " loading=".

/var/www/tests/phpunit/tests/media.php:2931

[github-actions]

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