Editor: Add unique classes to `.post-attributes-label-wrapper` paragraphs for...

Editor: Add unique classes to `.post-attributes-label-wrapper` paragraphs for easier JS or CSS targeting.

Props sathyapulse, sabernhardt, garrett-eclipse, noisysocks.
Fixes #44408.
Built from https://develop.svn.wordpress.org/trunk@47228


git-svn-id: https://core.svn.wordpress.org/trunk@47028 1a063a9b-81f0-0310-95a4-ce76da25c4cd