21.4-RC3

Changes compared to: 21.4-RC2

Non user facing:

• Removes unwanted comma from the dismissible BF banner in the metabox. #20724
• Removes unwanted whitespace from the BF banner in the sidebar. #20724
• Fix sidebar responsiveness in General page. #20728
• Adds the Yoast icon to the Premium page's Premium card. #20727
• Avoids showing the internal linking suggestions upsell when in the category/terms editor. #20720
• Adds Black Friday banner to upsell block in Settings page. #20725
• Adds different upsell label to the button for Black Friday in the Upsell block in Settings page. #20725