Theme JSON: include block style variations in path only output of get_block_nodes

[ramonjd]

What?

Follow up to #66002

Including variations in the nodes array when 'include_node_paths_only' => true

Discussed here: https://github.com/WordPress/gutenberg/pull/66731/files#r1830311575

cc @mukeshpanchal27

Why?

#66002 added and $include_node_paths_only option to get_block_nodes() to improve performance.

When true this option tells the function to only return paths, and not selectors, for consumers that only needed paths to style values.

For one of the conditional blocks, block style variations wasn't included.

This PR adds them to the array of paths following the existing model $node[]['path' => [], 'variations' => ['path' => []]]

How?

Just adding the same loop but in the $include_node_paths_only condition block.

Testing Instructions

PHP unit tests should pass.
Smoke test the editor. Should be all 👍🏻

[github-actions]

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Co-authored-by: ramonjd <ramonopoly@git.wordpress.org>
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[github-actions]

Flaky tests detected in 5a5a99b.
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/11810291831
📝 Reported issues:

• [Flaky Test] submenu click on the arrow interactions #61884 in /test/e2e/specs/editor/blocks/navigation-frontend-interactivity.spec.js

[aaronrobertshaw]

Thanks for fixing this up @ramonjd 👍

✅ Unit tests are passing
✅ Variation paths in include_node_paths_only flow are now consistent
✅ Smoke tested mostly in TT5 focusing on block style variations etc. No issues found.

LGTM 🚢

[ramonjd]

Thanks for the quick review!