Manually add loading=lazy in certain image tags loaded by WordPress

[superpoincare]

in #44427, the feature to lazy load images by default was added.

However it doesn't work on all images, only ones filterable with certain filters.

One such example is the image /wp-includes/images/rss.png loaded by the RSS widget.

Such images need a loading=lazy attribute added manually.

[sabernhardt]

For the RSS widget icon, the lazy-loading attribute is included in my patch on #52224.

These two functions also create markup for images in the wp-includes directory:

• the_embed_site_title
• translate_smiley

[Mista-Flo]

That was fixed in this ticket: #52224

[a4jp.com]

Just a question. Does this include the option to type in something like notlazy as well as lazy? Sometimes WordPress just makes all images above the crease lazy load. Both setting should be an option to force it to select the option we want if the CMS gets it wrong.