Update all references to the Verse block to Poetry

[ellatrix]

The label of the block has changed since ​https://github.com/WordPress/gutenberg/pull/74121, so we should make sure references to it in themes etc. are updated.

I've updated all references in all themes.

I've replace the Verse block name in comments and change wp-block-verse to wp-block-poetry class.

In twentytwentyone there was a need to change the name of a folder, then change the imports and then make a build. I hope I did these well, if not, let me know where I was wrong.

Trac ticket: https://core.trac.wordpress.org/ticket/64658

## Use of AI Tools

None used.

Undo any changes to the .wp-block-verse class name; the Poetry block still uses that class. The sass folder name should not need to change either.

To avoid confusion, I recommend editing "Verse" to "Poetry (Verse)" in the comments.

Also, please update your fork. It still contains IE styles for Twenty Twenty-One, which were removed in r61628.

Thanks @sabernhardt for your hints.

I have reverted all class names and the sass folder.

I have edited "Verse" to "Poetry (Verse)" in the comments.

And finaly, the fork is up to date.

Let me know if I missed something.

[sabernhardt]

The PR updates 11 lines of CSS comments, and I did not find any similar mentions in the themes when searching "Verse" (capitalized) or "verse " (lowercase followed by a space).

Add props: SirLouen (from ​GB74121)

[sabernhardt]

When I used npm run build for Twenty Twenty-One, it did not change the .map files. However, I recommend trying it again before committing.

Could you restore the branch and reopen the pull request? It was not committed.

Sorry for the mess !