Bundled Themes: Update all references to the Verse block to Poetry.

Original PR from Gutenberg repository:
* [https://github.com/WordPress/gutenberg/pull/74121 #74121 Rename Verse block to Poetry]

Reviewed by wildworks, SergeyBiryukov.

Props jsmansart, ellatrix, wildworks, mukesh27, sabernhardt.
Fixes #64658.

git-svn-id: https://develop.svn.wordpress.org/trunk@62112 602fd350-edb4-49c9-b593-d223f7449a82