New like button markup with class selectors + also updating other labels on the page.

[isoos]

• Display the /my-liked-packages page the same way as other package listing. #8887
• refactored the rendering of the like button, preparing for making it available on package listing pages
• update the the template and the like-handling in JS: instead of using the id attribute, relying on CSS class attributes
• the CSS name was moved to the <component>--<subcomponent> pattern
• added integration test, since we didn't have it with the button
• also updating the two "larger" like labels on the packages pages (with extra data attribute for filtering that is needed for the listing page)
• the rendering or other behavior of the button didn't change (available on staging)