Import Classic Menu using the menu name as the block menu title

[getdave]

What?

Fixes Classic Menu import in the Nav block to use the menu's name rather than it's slug for the Navigation menu's title.

Spun out of #48625 just in case that one doesn't land.

Why?

Using the slug for a title is sub optimal. We should prefer the menu's name as it maps better to the post title.

How?

Using the classic menu name attribute rather than slug when create the Navigation menu post (wp_navigation).

Testing Instructions

• Delete all Navigation Menus at http://localhost:8888/wp-admin/edit.php?post_type=wp_navigation
• Switch to Classic Theme.
• Create Menu with a name you can remember.
• Switch to Block Theme (do not visit editor!)
• Go to front of site (this should import the Classic Menu).
• Go to http://localhost:8888/wp-admin/edit.php?post_type=wp_navigation.
• Check the title of the imported Navigation menu matches with that of the Classic Menu

Testing Instructions for Keyboard

Screenshots or screencast

[github-actions]

Flaky tests detected in dc9cfea.
Some tests passed with failed attempts. The failures may not be related to this commit but are still reported for visibility. See the documentation for more information.

🔍 Workflow run URL: https://github.com/WordPress/gutenberg/actions/runs/4342151358
📝 Reported issues:

• [Flaky Test] default to the only existing classic menu if there are no block menus #48033 in /test/e2e/specs/editor/blocks/navigation.spec.js

[draganescu]

Good catch